I finished my first build on Christmas Day and couldn't be more happy with it! The total came price was much cheaper than what's displayed below; it was only about $900 when I ordered.
CPU- I was going to go the i3-H77 route, but then Vishera came out. I read reviews and compared benchmarks, and decided I'd be better off with the FX. There is no lack in gaming performance whatsoever so I believe I made the right choice. Soon I'll get an aftermarket heatsink and start some overclocking.
Motherboard- This had everything I needed and kept me at my budget, so I really couldn't justify spending another $50 on a 990FX board just to have the latest chipset. It's got plenty of SATA ports, USB 3.0, and has decent enough VRMs for me to get a modest overclock. However, it does lack front panel USB 3.0 and Firewire (if for some reason you should need that) so look the board over first if you need either of those.
HDD- Works fine, plenty of storage, boots Windows 8 in a matter of seconds.
Video Card- Best part of the build, honestly. I love MSI's cooling system. On 1050/1400, it maxes BF3 at around 40-45 FPS and never goes above 53C. Very nice card, I love it.
Case- Looks very nice and feels quite solid. It's got plenty of space and airflow to keep my parts cool and lots of cable management potential. I obviously haven't taken full advantage of that (as you can see in my pictures), but I will very soon.
PSU- Decent. I would only consider it semi-modular since most of the cables (even one I didn't use) come attached and are pretty short. If it weren't on sale for such a great price I wouldn't have gotten it, but it does the job.
Monitor- Smaller than I would have liked , but great nonetheless. Beautiful 1920x1080 picture quality with DVI plugged in. It's even got built-in speakers, which is helpful so I don't have to wear my headset all the time.
OS- I was hesitant to get Windows 8 at first, being used to 7, but I bit the bullet and got it anyway. The boot times are insanely fast, I thought I was booting of an SSD at first. The Metro UI takes some getting used to, but after a while I found it was a viable replacement for the old start menu.
Keyboard- This is probably where I cheaped out the most. It's got a kind of a cheap, plasticy feel to it, but I guess that was to be expected. Other than that, I like it. The LED backlight comes in handy at night and the macro keys work well. All in all, a decent budget gaming keyboard.
Mouse- I've always used Logitech mouses for a reason. It's got a very sturdy, heavy feel to it. The sensitivity switching buttons also come in handy too.
So that's my build! Not bad for a 14 year old if I do say so myself ;). A huge thanks to the guys at /r/BuildaPC for helping me out. The build was really fun and for $900, I'd say I spent my money well. Thanks for looking!