Is there a particular reason you went with an AMD CPU? AMD gets beat by Intel at almost every price point.
I would recommend getting 8gb (2x4gb) of DDR3 1600mhz RAM. G.Skill make some good kits, I particularly like their ARES line because they have a lower profile and don't conflict with the CPU heat sink like some other kits.
You'd be better off with an i3-2100 than a FX-4100. Here's a comparison between the FX-8150 (8 cores vs the -4100's 4 cores) and the i3-2100. They trade blows across the board. The i3-2100 destorys the FX-4100
-Stupid PC partpicker always puts MicroCenter price first for Intel CPUs. That price is In-store only. Meaning you have to actually live near one to buy it that cheap. Its $200-220 everywhere else.
- Yes I went with an Sandy Bridge 2500K instead of Ivy 3570K. Why? Because its usually cheaper, and Ivy Bridge despite being newer, offers absolutely no improvement over Sandy for gamers (less than 1% improvement) and yet the Ivy typically costs more.
- CoolerMaster 212+ CPU cooler instead of 212 Evo. They perform almost identical, but the 212+ is $10 cheaper.
- No I didn't go with the case you wanted, you can drop down on the video card a little bit if you like. The next step down would be the 7850. Still a pretty good video card, overclocks well enough to perform on par with a stock GTX 570.