Both boards may be the best in their class. For ocing, KG7-RAID,
1. because of SoftMenu III
2. All KT266 boards have a bug that once the Fsb goes above 138MHz, USB goes out, the only workaround is a PCI USB card.
A7V266 should be a solid board, but it doesn't have the most ocing features, plus the bug mentioned above, but it has outperformed KG7-RAID, but still I think KG7 is a better overall board. Plus, in addition to what Nelson mentioned, KG7-RAID has 4 DIMM slots, but also it supports 4 Unbuffered DIMM's (Unsupported by Abit or AMD though) unlike other 3/4 DIMM AMD 760 boards. But still, I would wait a month or 2 because not only are enthusiast type SiS 735 boards just starting to come out, but also we still haven't seen how nForce performs so i'd wait for nForce benchy's and for boards like the Asus A7S266 (SiS 735) to come out so u can have ocing boards (The only 735 boards are from ECS and Pcchips, while they are both good boards, they don't have ocing features).