The MB is Crossfire. Intel chipsets (P35 here) support AMD's multi-gpu. If you want SLI, you need to get an nVidia chipset (650i SLI, 680i, 750i, 780i). You will OC on it just fine.
Pick a better PSU. Look at the PSU sticky in the builder's section for some good choices and advice.
The OS you chose is worthless. If you're going Vista, get at least Home Premium (the "system builders" part is OK as long as you accept all troubleshooting yourself). If you want to see all 4G of ram you're getting, get the 64 bit version.
Lastly. Video card? the P35 doesn't have onboard graphics (G series does).
When the dust settled, our second half of the benchmark testing indicated that we have a new champion among CPU coolers: the OCZ Vendetta 2. The trusty Xigmatek HDT-S1283 from which it borrowed its design from tied for second place with the Kingwin RVT-12025 clone.
^+1 for CPU. Even a Corsair 450VX would power that build.
Yes the Xigmatek might be better the the OCZ Vendetta 92mm, but not the Vendetta2. Plus you have to consider the size of the Case the OP is getting.
This is the Vandata2 @ newegg: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
but the XIGMATEK S1283 is $37. So for a 0.75C gain the extra $ is not worth it. But I have to agree, the OP needs to have a good/big case to fit the S1283. Also it looks like the review didn't use the bolt in kit, so that may or may not even out the temps. Also lapping would help gain that 0.75C over the OCZ Vandatta2.