Depends on how much you wanna spend. Cary C is the tops but you pay for that. I prefer Klamath River myself. Fantastic work! There's others also but if you want medallions, these two and I think 41magnum on the Ruger Forum are the only ones installing them.
Remember, while they're one size fits all more or less, the stainless grip frames are very often ever so slightly larger than their steel counterparts.
