just like Mr Pizza said (mm i'm hungry ) i would definitely go for a 955. you can easily over clock them to 3.4~3.6 and be completely fine. and in terms of hard drives i'd really recommend going for a 500gb for ~$5 more. and also, if you're really trying to save money and you are from california (which i'm assuming since you're getting taxed) I would look to buy some of the stuff from other websites such as amazon or tigerdirect. they both offer free shipping and tax free sales (since both are out of state [this is only if you're from california]) which leads to probably a good ~$100 savings in the end.
and in terms of the graphics card and motherboard.. if you are 100% dead set on going crossfire down the road, then sure, go ahead with the 5850. but if you aren't going to be gaming in huge, huge, huge resolutions then I honestly would just cut your losses as a budget build right now and just opt for a cheaper gtx 460 or even just a single hd5830 (if you NEED crossire) as that will save you ~$40-70 depending on which route you go. and really, for the price of going for the 5850 for the potential crossfire setup, you'll still probably be way better off just doing a core upgrade (a la cpu/mobo) 2-3 years later and a gpu upgrade shortly following that rather than dropping $150-200 on another 5850 in the next couple years.
everything should be goooood to go. case/psu/ram are all good to go (but do make sure your specified ram kit is under the QVL list for your asus mobo [you can check by going on the asus website and searching for your specific mobo])
like i said, you can download the .pdf qvl list from the actual asus website for your specified mobo. i'm not gonna do that work for you but the .pdf will tell you exactly which model number g.skill ripjaw modules will work.
Antec EarthWatts EA750 750W Continuous Power ATX12V version 2.3 SLI Certified CrossFire Ready 80 PLUS Certified Active PFC "compatible with Core i7/Core i5" Power Supply
Antec Three Hundred Illusion Black Steel ATX Mid Tower Computer Case http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...
^Upgraded to illusion for $10 more, however the illusion can also be combined with some ripjaws (1600, cas 9 though) if my PSU is a weakpoint
ASUS VH226H Black 21.5" 2ms(GTG) HDMI Widescreen 16:9 Full HD 1080P LCD Monitor 300 cd/m2 1000:1 (ASCR 12000 : 1) Built in Speakers http://www.newegg.com/Product/Prod [...] 6824236051