I am happy with the case. I am happy with the PSU, read the reviews and they are very good. The motherboard: ASUS M4A87TD USB3 (ATX) I am not sure about because I could go for the ASUS M4A88TD USB3 EVO (mATX) because it's $10.00 more and it's got the 880G chipset instead of the 870G but it's mATX which for some reason I don't like compared to ATX. I am happy with the processor, great value. I am happy with the RAM, good latency. The Video Card - I could go a 6870 for about $40-50 extra but I am not a huge or hardcore gamer or anything, the games I will be playing are GTA San Andreas, Unreal Tournament 2003/2004/2007, Left 4 Dead 2, Dawn of War Soulstorm, CoD MW2 etc...As long as the games don't lag and play at an avg fps with quality in-game-settings set to medium, I am happy. HDD - 2TB is more than enough for movies, music, games and software etc...SSDs are too expensive for me and I don't find it necessary. I am happy with the Optical Drives. I am not sure whether to go 21.5" or 24". I am happy with the speakers, great price for a 5.1ch system and reliable brand. Mouse/Keyboard - wireless, nice looking mouse too and it's good value, don't need expensive Logitech/Thermaltake keboards/mouse etc..Headset: It got a 10 star review in PCPP magazine, 7.1 Surrround Sound =). Green Cathodes =)
If you are going to spend 1400 I'd go with an i5 2500k/z68 cpu/mobo combo. It's far superior for gaming and relatively similiar in price. the rest of your build looks fine. Since you are playing unreal you could go for an nvidia card to gain the use of physx. I have the logitech 5.1 system and it's nice especially for a sub 100 system.