well I am not a intel fan, but GET A CONROE!!!!. it will cost you about the same as what you are currently looking at, it is really called core 2 duo. I would advise reading up on it on the internet, Newegg is good to read reviews and see specs. www.newegg.com
Also if you wnat to play UT2007 you shoiuld at least get a 7900gt instead of a 7800gt. I recomened a EVGA 7900gt KO.
I agree with above that HDD is really not worht that much money. I suggest getting a WD caviear 7200rpm 16MB cache with 250gigs of space, it will actually cost less.
But other than that it looks good, my advice is to just hang out on the forums fo ra while and soak up what people are talkiong about to leanr a lot more.