If it were me, I'd definitely go rx-8. My uncle has had an 06 since it was brand new, has no problems and absolutely loves it. By some miracle he let me drive it, and I fuggin' LOVED it. I know I'm going to get one with an MS kit somewhere down the road. He's also had no issues with it mechanically. I think the whole anti-rotor debates come from people who don't maintain them correctly, as that's what most rotary owners claim. Just go drive both and see what you like, you may pick the S, you may pick the 8. Just need to get some seat time in both.