jostenmeat--
The 906 would work pretty well as a VP I think. In fairness, I use my 906 more for pass through and let my RS20 do all of the heavy lifting. The 906 is ISF certified though and has RGB independant color controls, sharpening, NR, mosquito, etc. VP controls, customized scaling abilities, as well as gaming modes, Day/Night/Night/Source presets, etc.
My thought is the independant color controls may help you tame some of the oversaturation problems some people have with their RS1. If you need a good receiver upgrade, I can't recommend the 906 enough. If you already have a good receiver that you like and just want a very good VP, I'd say just get a VP and be happy with it.
If there's anything specific you'd like me to check up on, let me know and i'll be happy to run some tests on my system.