This page (actually starting around post #612) has been the most civil off topic discussion in this entire thread. It's actually quite informative/interesting too. I'm shocked. It's starting to make me wonder if going with a mid-range SLI next time around would be a better choice than a single ~$500 GPU. I've never SLI'd before, but the more I see it from a cost perspective.....
I have done the SLI over more expensive single GPU route with 2x GTX460s and for the most part it was excellent. The problems only raise their head with the non AAA titles when Nvidia elect not to spend lots of resources creating working SLI profiles.
Flight sims etc rarely support SLI. As long as you only use mainstream games SLI is excellent.
