I'm getting almost the same machine except I went with some very low latency G.Skill RAM and I'm using an OCZ RevoDrive X2 240GB which runs in a PCIe slot.

I got the same card but didn't bother with the over clocked version. I had a huge amount of trouble with 2 or 3 XFX cards that where slightly overclocked and as soon as I undertuned them down to factory defaults all my problems went away so now I just steer clear as a rule of thumb.

I also replaced the stock cooler with a different one as apparently the stock one on the EE is noisy and huge and not that great.

Real really happy to hear that you can run shit on Ultra and High. That is exactly what I want to do. I also bought 2x 1TB Cavier WD Black drives that are SATAIII to raid together to do alot of FRAPs on.

Are you happy with the sound card on the Rampage II Extreme or would you get a proper Creative Card?

I was considering a second GTX580 but good to know there is no point - I tend to shy away from SLi