A review of one or two manuals is the best I can do. Not much oc on the G33, P35 the clear winner.
If you hold off for a while the AMD side has a Biostar TF7025/7050 uATX (integrated 7025 or 7050 NB with nVidia 630a SB) that can oc very well. Biostar offered it to Intel first (PR is dated 2/07) for the 775 socket: Intel said NAH!, but has quietly decided to adopt it b/4 the 4thQ.
edit==> The reviews of the AMD setup is a 5egger at newegg. Looks promising for 'the dark side'.