So I was sitting at my 4 year old craptop a few weeks ago thinking what new console I should get (I own a 360 now), and my roommate who just built his own full tower convinced me to have a go at building my own console replacement. I wanted to play ultra 1080p at 30+ fps, and be able to do so a few years from now. So i pieced together what I wanted and finally rush ordered all the parts with the few free days I had off. I went all newegg because it seemed the most reputable vendor and I'm new at this building business.
So then I was building at the first thing that came to mind was, "This is case is so small, awesome". 4 hours later I realized it was a lot harder to build in a small case. It was a great experience and everything is working fine, I've tried a few games at the temp never got above 50 C for the CPU and 55 for the GPU.
NOTE: If you are building in this case, install parts in the following order. It will save you hassel. Storage (including power and data connectors) -> PSU -> Motherboard -> GPU -> headers.
CPU: One hell of a CPU. It's many times faster than my old laptop and stays relatively cool (I haven't overclocked yet, though I easily could).
Cooler: WOULD NOT RECOMMEND WITH CASE. Great cooler that works great, but in this case there is less than an inch of clearance between the radiator/fan and the GPU. The tubes touch the back of the GPU, and unless I want to kink the tubes, it's going to have to stay that way. Also comes with thermal paste already applied, so you do not have to buy your own.
Mobo: No problems so far, the built-in wifi is a must have since there's only 1 PCIe slot (which is taken by the GPU). Also stays cool, has USB headers, can support 1866 and up for RAM. It has all I want at a reasonable price.
RAM: Pretty self explantory, I needed RAM with < 1.5V because that's all the processor can support. This was pretty cheap and a had good ratings.
Storage: A SSD for my OS, and 1TB for games. Both work well, and with the special adapter I bought, I could fit another SSD very easily.
GPU: It was cheap, and very powerful. I heard horror stories from other buyiers, but mine worked like a charm. Very quiet, and the gaming app is very useful. I highly recommend this card.
Case: It's the only mini-ITX case that supports a full sized PSU. That being said, building in it was extremely difficult, and with my huge hands, it took many tries to get certain screws in.
PSU: If you go mini-ITX, you NEED a modular power supply. Unfortuantely, this one is massive and cuts down on a lot of potential wire managment. The fan has yet to turn on, which means it's either defective, or is too powerful for my build. Either way, would've gone with a smaller, less wattage equivalent in the future.
OS: Full version of windows so I can install it on many computers. Don't judge me.
I also bought an external disk drive to play my old Age of Empires 2 disc. Build maxes out game no problem.
EDIT: After playing Dragon Age Inquisition for a while, I had to remove the side panels so my GPU and CPU cooler could breath. It's not much of a hassle, but it dropped a noticeable 15-20 C when I did.