I have an A7V, and it is (finally!) working well for me. But, getting it running stable was quite an adventure - I had way more problems than with the Trinity 400 in my other machine. Then again, I have a pretty early revision (earlier than 1.01p), so maybe that's one of the reasons I had so many problems.
In retrospect, I think right now I'd recommend a Abit K7T (non-RAID) with a Promise Ultra100 PCI card separate (if you want an extra ATA100 controller). From what I've read, the Abit is as stable/overclockable (if not more so) than the A7V, and overclocking can be done easily from the BIOS. For my A7V, if I want to OC above 800MHz, I have to go to jumper-mode... As for the KT7-RAID, I've had bad experiences with Highpoint controllers (BP6), and the RAID isn't that great (aside from synthetic benchmarks) from what I hear. Promise controllers work well for me, althogh bootup can be a little slow (I have an Ultra66 PCI card, and the Ultra100 is built into the A7V).
Just my two cents...