I started this thinking I would make something with an i5-4670K and two GTX 760s in the MicroATX form factor. It started that way and I even had it working in November last year (minus the GPU and i7) It took a while for me to get the remaining parts and I at one point considered a GTX 780 Ti, but settled on a GTX 770. I ended up using the i5 I originally got for this in a mini-ITX build for my aunt. I will be adding a second GTX 770 within 1-2 months (I already know that the usefulness of this will be relatively limited because of the vRAM, but I still think it's worth it if only to get the Over 9000 achievement in 3DMark). I think the parts selection pretty much speaks for itself but I know some people would rather see a breakdown and some people only skim this description so here it is:
CPU (i7-4770K): $120.70 (post tax + shipping) from Intel Retail Edge. Nuff said.
RAM: Very fast stock speed and quite enough capacity for a very good Shell-Shocker price. I plan to add the 16GB kit later for 24GB total. Not because I need it, just for overkill.
Motherboard: This was the most difficult part. I wanted something MicroATX with SLI capabilities and really liked this board because it has mSATA and mini-PCI-e half height slots. I got the board in October and it worked well through mid November until it just stopped turning on (no fans, just no response to the power button). I had to RMA it and got it back almost three weeks later. Overall I would rate ASRock's customer service a 4.5/10. The board didn't take all too long to get back to me but their communication is terrible. After I got the RMA # and sent it out, it was impossible to get any kind of response from them. I emailed them about five times between one and two weeks after I sent them my board simply trying to find out about the status of my RMA. It arrived one day without me receiving so much as a tracking number. Works well now though.
Corsair H80i: Christmas present.
SSD: Great drive was only 129.99 a few days after Black Friday. I got two and used one in my aunt's computer.
GTX 770: I know it shouldn't really be a selling point for it, but I really like that it is just straight Nvidia branded. I also got it for a good price and I really like it so far.
Fractal Design Define Mini: $50 on craigslist w/ all accessories and in great shape. Came with box.
CX 750M: MIR from Newegg.com. Nuff said.
Intel AC7260: Wireless that doesn't take an expansion slot I could use to SLI GPUs plus Intel WiDi and 802.11ac. I got it for free through a fluke. I ordered one to put in my dad's all-in-one to use with our new AC1750 router, and Newegg sent us a pack of ten. They never asked for them back.
20GB mSATA SSD: Taken from my laptop when I replaced it with a 120GB Intel 525 series. Being used to Beta SteamOS.
I did have to buy some antennas through amazon because the board didn't come with any. Other than that I won't say that it has "taken everything I've thrown at it." It does pretty well but it will drop as low as 30FPS in Batman Arkham Origins in some outside scenes on a single 1080p monitor. At some point I will buy one or two more SSDs (same model) to put in RAID 0.
I can't wait to hear what you guys think about my new build.