so far, there are from what I've seen 2 760 based boards out.
ASUS's A7M266, and Gigabytes board (I don't remember the #).
both don't appear to be refined well at all. I will wait for second revisions/new boards to come out before I form an opinion on AMD's 760.
I also find it highly unlikely that the Via chipset will be able to outperform the 760. We have not yet begun to see the performance of the 760 if you ask me.