But bravo to you for actually doing your homework.
You sure you want that mouse and KB? Certainly you can do better at staples/best buys and atleast play with some better models. Just saying.... Same with the speaker, if anything that monitor comes with low 2watt speakers. Which should suffice until you get something real with a subwoofer.
Regarding the filter, cetainly you can cut a thin layer to fit but honestly I don't think it's worth loosing sleep over.
That is nice ram, almost the same price as the Cas 8 I posted. Problem is, the Gigabyte does not accept 1600. XD I actually would prefer a better Keyboard, Mouse, Speakers. As fr the HAF 922, dust is a pretty big thing here for some reason.
I thought the AMD X6 was not that good in gaming. As for the ram, G.Skill was my first choice, just say that Mushkin had a lower latency one.
Check out the performance charts and pick whatever 500 GB per platter drive performs best under your usage patterns. The 2 TB WD Black and XT from Seagate are good choice but at smaller capacities, you are limited to the Seagate 7200.12 or the Spinpoint F3. The 7200.12 excels in gaming, multimedia and pictures whereas the F3 wins at music and movie maker. See the comparisons here (copy past link in manually, link won't work in forum):
Completely forgot about the Scythe 2100. On this list thing, the Performa beat it. Plus, right now it is cheaper, just around $2.00 though.
I was considering a Intel build. I thought they were not going to make that many more parts 1156 and the 1366. I figured if the Bulldozer, what ever it is, for AMD comes out, I could pop it into the Gigabyte motherboard.
I was really considering that Logitech MX518, price is kind of high though. The keyboard looks nice! Still high price point. =P Will look into it though.
On a side note, the Performa is supposed to have a Mounting system thing that is HARD to use.