Actually, I would love to get a full frame equipment, but it would be a waste to dump money on a 1DsMkII at this point. I'm happy with my 10D for now.
The only factor that would lure me in to getting a 20D body would be the ISO. Heard high ISO's in 20D are not much of an issue like in 10D. I don't prefer flash. Higher ISO with minimal noise is always welcome.