*The CPU: While I'm not overclocking because the cpu gets pretty toasty as is, I chose a K-series processor because they hold their value much better than non-k series chips, if I ever decided "I don't a SFF build anymore, I want to OC!" then I could, and I picked it up for $180 on Black Friday
The Cooler: I needed something low profile, really*, really low profile (<60mm). I was initially considering a Corsair H60, but mounting the rad in the front would make it even harder to cable manage all these cables, eliminate the hard drive mount (i think) & I'd have to figure out something to do with the tubing. As such, I settled on the NH-L9i.
*The Board:I was going to get an H81 board, but I thought I was going to have a 3rd HDD, so I opted for the B85 which has 4 sata ports. This board is also really nice because all the front panel connectors are very thoughtfully placed, on the right side of the board! 10/10 would recommend.
*The ram, SSD, HDD, and GPU all came out of my previous build.
The Case:sigh* Where do I even start? I know! If you're an inexperienced builder, this definitely is NOT the case for you. The best way I can describe it is, everything gets in the way of everything else. Now, I'm not saying this is a bad case, I'm just saying you should only take this on if you're more experienced with building computers. Now on to actually building in it. First I put the memory, cpu & cooler in the board. I then mounted that whole assembly into the case. Next I slid the GPU in front the front and installed that into my board. Then I mounted my SSD to the floor of the case under the GPU, which I later changed because I realized that once you have all the cables from the power supply going every which way, that SSD becomes impossible to access. To fix this issue I velcroed it the the back side of the PSU support bracket. Speaking of the PSU, dealing with the cables is an absolute NIGHTMARE. There is basically zero cable management options in this case except to just shove all the cables in the front like I did.
The PSU: I took it from my previous build, but I definitely am going to get a silverstone sfx power supply and special ordering some short cables. Either that or I may mod it by shortening some of the cables...maybe.