I agree, sounds like you don't have anything to lose on your current W7 RC so that would be the easiest for sure. I'm doing this exact thing as soon as I can back up some files that I don't want to re-download. It'll be nice and clean with no extra boot options to confuse one, done this many times.
Everything that irritates us about others can lead us to an understanding of ourselves. -- Carl Jung
eVGA X58 tri-SLI, i7 930 @ 3.8GHz., Corsair 6GB Dominator, Inno3D GTX470, eVGA260
ASUS P8P67 Pro, i7 2600K @4.60 GHz, 8GB RAM, eVGA GTX 460