eh that stuff is good, but i (and 1/2 of the people here) can build you a better one.
That case looks pretty good cooling wise, but i've heard nothing buy good things about the TT Tsunami
That mobo is good if you going crossfire, but your not.
DFI Lanparty Ultra-D
it can be modded into an sli board.
You might be able to squeeze a 7900GTX into your budget.
with the cooling you picked you might be looking to overclock, but im not a mind reader cause ythe RAM you picked out suck for oc'ing. you can oc an opty 165 to around the performance of a 4400+
AMD opteron 165
for ram both of these will work fine, overclocking or not.
G.SKILL Extreme series 2gb dual channel kit
G.SKILL Value series (used to be Extreme series, Pzero got his fsb around 270, or 290 i cant remember with this stuff)
You hard drive was fine.
WD 250gb 16mb cache Hard Drive
For your PSU you can do better for cheaper with the antec truepower II 550W.
Antec Truepower II 550w PSU
the sound card was good but you can do better with the X-FI extreme music.
Creative Soundblaster X-FI
The zalman 9500CNPS is a great cooler, but i've heard the TT big typhoon is a better cooler, and cheaper too.
Thermaltake big typhoon
Unless you really want the media center edition you can just get the home.
Whindows XP home edition
hey i added up your build and it came to $1600 (if i added right) and the build i gave you which will give you one of the best computers money can buy only came out to $1650 exactly. just having the 7900GTX insted of the X850XT will give you so much of performance jump, it's ridiculous. Please, take my advice and build what i posted, if you dont your a retard.