The KG7 is an AMD 760 based board and is the first offering from Abit in the DDR realm (I believe) so expect it to be top notch among AMD 760 overclocking. (Its only real competitor in this market is the Epox 8K7A).
SiS 735 boards are not going to be around until fall at the earliest.... I agree with Phil on the KT266 thing, you'll see good KT266 boards before you see a SiS 735 board (or a nForce, even).
SickBoy