@ Treble20: surely you just plan to use this for Surfing, Word and the odd email though right? Maybe fire up solitaire once in a while? lol.
It's funny, my 2500k system was originally bought (cheap bundle, I had a GTX 570 already) as a temporary Gamer. I ultimately planned for it to be my new media PC, using the iGPU to keep a nice, simple, cool & quiet system. However, the system turned out to be so good I bought a 2nd 570, better PSU and ultimately spent an insane amount water cooling it all.
I still dabble with the idea of picking up a 690 (they can be had for £700 after all) and popping a block on it. Then of course I'd be obliged to water cool both my Gateway and Media PC's to take advantage of my blocked up 570's...a slippery slope lol.
Water cooling is great fun. But, when first starting out, you need to buy sooo much stuff. Now I'm fairly established with things like a spare CPU block (ready for my older kit) plenty of tubing, a spare 360 rad, compression fittings and the like. So, I just need to add to the pool so to speak making it easier to cost up as I just need the big obvious items such as appropriate blocks etc. for the most part. Also, experience now allows me to more readily identify what I'd need for a given install.
If I do migrate my external cooling solution to my next PC however, I will of course need buy some new bits to keep the old one going. Assuming my 2500k gets re-tasked as a media PC, that's a simple case of a Pump & res and maybe a good 240 rad as I'll just be cooling the CPU & making use of the iGPU... Worst (best?) case I keep a 570 in there and up-spec the rads a little. For a media PC I DO want a tidy fully-internal build.
I do get your concern re: loosing a 690 - I lost one of my 570's for a while and it was HORRIBLE going back to a single card in certain games. However I'd say you'd have to be particularly unlucky for a 690 to die as they really do seem to be built to a quality above your average card. As long as you take care with fitting the block (take you time, it can be fiddly to unpractised hands, but it's not really difficult) that card will serve you well for years.
Oh, I rambled again didn't I?
Scoob.