Well, I went ahead and got the Apollo USB... unboxed and had it all set up in one evening without any problems at all... I did all the recommended tweaks without any issues. I really does sound fantastic, and feels nice in the hands as well.
I'm primarily running Ivory II grand piano and East West's RA, and the difference in quality at 192k is noticeable. I haven't really put it through its paces yet, but it seems like the Apollo hasn't broken a sweat so far...
As far as latency, at 192k, ASIO is reporting 9.2ms round trip (haven't done any testing at 44.1)... As a piano player, I can't discern any delay at all. I'm going to stay at 192k as long as it'll keep up. It really is a lovely sound (although I do have to get around to putting up my bass traps).
As far as Nvidia drivers go, I haven't had any problems with it so far. It's possible that the drivers were my issue with my previous interface (Tascam US-1800), but since the US-1800 was no longer being supported, I decided to bag it and never really found a root cause.
I did find that Nvidia had installed some sort of HD Audio component, but I properly disabled it and, so far, it hasn't reared its ugly head... Since I'm determined to stay fanless, my choices were limited anyway... thankfully for me, it seems to have worked out fine.
All in all, I'm very happy with my decision on the Apollo... thank you guys again for the recommendations...
Mike