Hey guys, I'm pretty confident that my planned new rig should work and is just enough over the top to be called over the top, but there are several things that keep bugging me and since I have no hands on experience with this specific hardware, I figured I better ask some people here, that have used many of the components I plan to use already, to get a better angle on things 
My planned rig is in my description, but here it is again, just for the sake of completeness:
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System Drives: 2x 256GB Samsung 840 Pro (In RAID0 config (*1))
Working Drives: 2x 500GB Velociraptor (NOT in RAID)
Data Grave: 1TB WD Blue (Legacy drive, will use this from my old PC)
Motherboard: ASUS Sabertooth Z87
CPU: i7-4770K
GPU: GTX Titan (*2)
Case: Fractal Design Define R4 (Windowed)
CPU Cooling: Corsair H100i (*3)
RAM: 32GB Corsair Dominator Platinum 1600 (*4)
PSU: Corsair AX1200i (*5)
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(*1): Yay, double the chance of complete dataloss!
(*2): I'm also thinking about 2x GTX 780 in SLI
(*3): As Tom mentioned, the H100i shouldn't fit in the top of the Define R4, I've seen people doing this without modding their case, but I don't know if it would work with the high profile VRAM Cooling of the Sabertooth. Fractal Design claims a 240mm rad can be mounted in the front, I will consider this as alternative option if top is too much of a hassle. My worry is, that the pressure would be a little too "negative" since the only intakes would then be 120mm fans.
(*4): Is 32GB maybe just a little TOO much over the top?
(*5): I may possibly buy another Titan later on, but could an AX860i for example also do the trick for a configuration of this kind?
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Additional Notes: I initially wanted to do a custom loop, but I'm very lazy and I hear custom loops are quite a lot of work, especially if you've never done one before. Is this true, if so is it still worth it and should I take the plunge?
I heard that the Define R4 is suboptimal for custom loops, if someone recommended a custom loop, what is a very plain case with great compatibility for custom loops?
Case cooling will be done by 3x Corsair 140 AF Quiet Editions (2 intake, 1 exhaust) + 2x SP120 Performance Editions (exhaust at the H100i Radiator (push))
I chose the Sabertooth Z87 because of its plain look, because I want the System to look really nice, so I'll also throw in some white LEDs and white cable sleeving. (Color scheme will be Black & White).
The PC is supposed to be a gaming PC that I can also use for 3D work (3D Design and CAD also) and 2D graphics design. Also it should be able to handle a couple of virtual machines simultaneously.
I'm a little interested in silence, but I have music on most of the time, so a little noise doesn't bother me. I was thinking about overclocking, but I heard bad things concerning heat of Haswell i7's which aren't review samples, so I'll decide it when I can assess the quality of my chip.
My questions, would you do any alterations to this thing, if so, what would you change and if you like, could you tell me why?
I apologize for this wall of text and if you actually read it all, I thank you very much!
Edit: Ah I forgot: Budget is 3000€ ± 200€ (~2500GBP with quite a little leeway)

My planned rig is in my description, but here it is again, just for the sake of completeness:
__________________________________________________
System Drives: 2x 256GB Samsung 840 Pro (In RAID0 config (*1))
Working Drives: 2x 500GB Velociraptor (NOT in RAID)
Data Grave: 1TB WD Blue (Legacy drive, will use this from my old PC)
Motherboard: ASUS Sabertooth Z87
CPU: i7-4770K
GPU: GTX Titan (*2)
Case: Fractal Design Define R4 (Windowed)
CPU Cooling: Corsair H100i (*3)
RAM: 32GB Corsair Dominator Platinum 1600 (*4)
PSU: Corsair AX1200i (*5)
__________________________________________________
(*1): Yay, double the chance of complete dataloss!

(*2): I'm also thinking about 2x GTX 780 in SLI
(*3): As Tom mentioned, the H100i shouldn't fit in the top of the Define R4, I've seen people doing this without modding their case, but I don't know if it would work with the high profile VRAM Cooling of the Sabertooth. Fractal Design claims a 240mm rad can be mounted in the front, I will consider this as alternative option if top is too much of a hassle. My worry is, that the pressure would be a little too "negative" since the only intakes would then be 120mm fans.
(*4): Is 32GB maybe just a little TOO much over the top?
(*5): I may possibly buy another Titan later on, but could an AX860i for example also do the trick for a configuration of this kind?
__________________________________________________
Additional Notes: I initially wanted to do a custom loop, but I'm very lazy and I hear custom loops are quite a lot of work, especially if you've never done one before. Is this true, if so is it still worth it and should I take the plunge?
I heard that the Define R4 is suboptimal for custom loops, if someone recommended a custom loop, what is a very plain case with great compatibility for custom loops?
Case cooling will be done by 3x Corsair 140 AF Quiet Editions (2 intake, 1 exhaust) + 2x SP120 Performance Editions (exhaust at the H100i Radiator (push))
I chose the Sabertooth Z87 because of its plain look, because I want the System to look really nice, so I'll also throw in some white LEDs and white cable sleeving. (Color scheme will be Black & White).
The PC is supposed to be a gaming PC that I can also use for 3D work (3D Design and CAD also) and 2D graphics design. Also it should be able to handle a couple of virtual machines simultaneously.
I'm a little interested in silence, but I have music on most of the time, so a little noise doesn't bother me. I was thinking about overclocking, but I heard bad things concerning heat of Haswell i7's which aren't review samples, so I'll decide it when I can assess the quality of my chip.
My questions, would you do any alterations to this thing, if so, what would you change and if you like, could you tell me why?
I apologize for this wall of text and if you actually read it all, I thank you very much!

Edit: Ah I forgot: Budget is 3000€ ± 200€ (~2500GBP with quite a little leeway)
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