Need build upgrade advice

[BucketInABucket]

Hello, OC3D. I'm having real difficulties deciding on what to do with my rig upgrade here.

I currently have this build. I want to upgrade to the 1080ti, and at the same time either unify the theme of my build, or scrap it and start with a MITX build.
I'm doing an electrical engineering course in the future and I live in the UK, although I semi frequently travel between the UK and Hong Kong. I'll be both gaming and streaming as well as doing engineering work on my rig. I currently game on an X34A but may switch to a 4k GSync display depending on whether or not a 32 inch option is available with an over 60Hz refresh rate. I will have at least £1100 plus the money I get from my sold parts at my disposal after factoring in the £700 that a 1080ti will cost.

I can:

1. Chose to keep the 6700k, just sell the motherboard and 1080, and get a new motherboard and 1080ti.
2. Additionally upgrade the CPU to Ryzen seeing as I'm already selling my current motherboard.
3. Sell the build entirely and get a MITX build with Ryzen.

There are no X300 chipset MITX motherboards yet and I'm undecided as to whether to go for a 1700 or 1700x, hence neither are present in the parts list.

Here are the pros and cons of the three options I've just laid out.

1. I keep my 6700k and just need to buy a new mobo and 1080ti. It's the least hassle and loses me the least in the short term but it's potentially a waste of a new motherboard in the long term depending on whether Coffee Lake uses the same socket.
2. I get the Ryzen performance boost, and the AM4 socket will be in use for the next 5 or so years, but it's uncertain as to how good Ryzen really is and will become, and I lose more money in the short term because I need to buy more parts.
3. I still get the benefits of 2, but in a much smaller, transportable and more space efficient form factor, and I'm unlikely to be able to afford a 2nd 1080ti to SLI with, but I lose the possibility of SLI and I lose the most money in the short term.

1 and 2 mean I have to stick with the ATX form factor which could become a problem in the future depending on how much space I have, as I have a rat's arse worth of room in next academic year's housing.

What should I do?

 

[AngryGoldfish]

ITX cases are not often that much smaller than ATX cases, not to the point where one needs to downsize to physically fit it into their room. If it's a width problem, an ITX case will remove an inch and not much more; hardly worth it in my opinion. Height would be a weird limitation. I can't think of many instances where height will be a point of contention. As for depth you can easily find smaller cases that still fit mATX or ATX motherboards. Jonsbo W2 and UMX4 come to mind. The Corsair 460X is a sexy case that isn't very deep, as is the NZXT S340 Elite. Fractal have the new Define C, Phanteks have the Enthoo EVOLV mATX, etc.

In my opinion, Ryzen benefits so much from a 4Ghz overclock that ITX boards might be better left to those that never overclock. They may not be able to handle the voltages and load. That depends on when they're released and reviewed of course, but it's something to take into consideration now. If you're streaming and multitasking and have the money for it an R7 1700 with a good cooler for a 4Ghz overclock and a decent sized mATX or ATX chassis will be bangin'. At the resolution you're playing at, Ryzen will hold up perfectly fine. You will not likely notice a difference from the 6700K, but you will notice the productivity gains.

I'm not sure why you'd bother buying a new motherboard if you kept your 6700K—which isn't a bad idea either incidentally as it's a very competent CPU for gaming and multitasking. I wouldn't bother SLI'ing 1080ti. It's already powerful enough for most resolutions. And with the things are at the moment you'll end up wasting £700 on games that only see a marginal performance gain.