Looking for a walk around camera that shoots RAW and has good ISO functionality. I shoot Canon 40Ds, this is for a friend but I will also use it. The new G12 is about $499, can get a used G10 for $325. If money is not really an issue, should I go for the newer model with better ISO performance and front control dial etc? Would prefer to hear from real world users who have tried both - I have read the reviews, both are great cameras I am aware. Thanks!