raks: Oh okay, thanks for the tips. Yeah I don't think I'd be able to sand it down. The grip thing is really what's balancing the 226 out - I like nearly everything about the USP (the deal is better too), but the Sig just felt better in my hand. The USP was lighter, I liked the mag release position better, it had a manual safety, was slightly smaller, but it just didn't feel as good as the Sig! The checkering is a cheese grater on the hand, but I wouldn't really want to make it bigger. So you like both then? Well it may just come down to what is cheaper.
heavenIsAlie: Oh yeah? I liked the positioning better actually, as I found with the SIG I had to adjust me hand position to get my thumb on there, but with the USP I could just flick my middle finger.
One more: Is there any distinct disadvantage to having a pistol that's slightly too big?
Thanks for all the help and info, and sorry for the indecisiveness!
-Rohann