I wouldn't buy the IP35P, it is very much a cut down budget P35 mobo and I wouldn't expect great feats of overclocking from it. The 3 phase PWMs aren't going to support quads well either should you upgrade in the future and it has no second PCI-Express 16X slot meaning you will never have the option of using Crossfire.
Edit:
If you haven't seen it on this forum, Abit have the IP45-Pro out soon:
Abit IP45 Pro Image and feedback of course :-)