The HAF 922 is a solid mid tower, and should hold every GPU except the super-long AMD cards (5970, etc). The HAFs also cool pretty well thanks to their airflow design.
I've never heard of LEPA before. Can't say for certain whether or not this is a reliable PSU. The 80+ Gold cert is pretty good though.
The larger VRAM model helps with multiple monitor setups, but not a ton with a single monitor. IMO you'll be fine with the 1280MB model. Plus, if you upgrade you'll most likely get a second GPU.
1866MHz RAM is only a *little* bit better than 1600MHz memory. I'd go with the kit danger kid posted; I have 2 sets of that and it games great.
Both will support SLI (need at least x8/x8 speeds on 2 PCI Express x16 slots), but they are pricey because they have the PCI Express 3.0 slots. However, A) you won't really be limited by 2.0, and B) you need an upcoming Ivy Bridge CPU to even use the 3.0 slots. PCI-E 2.0 cards will run fine in 3.0 slots, so no need to worry about compatibility.
The Z68 Extreme3 Gen3 is a pretty good balance, because it has all of the new upgrade features but is about the same price as a current model board.
The Hyper 212+ is an awesome cooler. It could get a lot of LGA 1366 CPUs to 4.5 GHz, and they were significantly hotter than the 1155 CPUs. Note that if you're just gaming, and OCed 2500K won't really do anything for you; it already games so well you won't really notice the difference (if at all).
Best hard drive out there. WD is overpriced now and Seagate is trying to make a comeback in the reliability area. This is the fastest consumer platter drive out at the moment.
Pass on this. Unless you're using an expensive set of 5.1/7.1 headphones or speakers, you won't hear a difference between this and the onboard audio. You can also add this on later, so no need to buy it now if you're strapped for cash.
One of the best pastes out there.
Keep in mind that this is an upgrade version. If you don't plan on upgrading the mobo for a long time, get an OEM/System Builders copy of W7.
EXTRAS:
You should be able to get a decent 23"-24" 1920x1080 monitor at that price. Anything below that seems a little small IMHO.
Quote:
CASE FANS:
(2X)COOLER MASTER SickleFlow 120 R4-L2R-20AR-R1 120mm Silent operation Red LED case fan
=19.98
Do you have a link for these? I'd like to know the noise levels (dBA) and airflow (CFM). Ideally you get high CFMs at low dBA.
Depending on the fan, this might be irrelevant. As long as you get good fans you won't need these. You're better off buying dust filters for the fans.
The M4 SSD is a good drive and is one I'd recommend as well. Another good one is the Intel 320.