Pretty slick looking revolver. At first I was thinking the 5 1/2" might be ideal but the more I think about it that 7 1/2" might be more fun.
I really enjoy long range shooting, like 200 yard plinking with a handgun, but don't like recoil any more. That long barrel would let you get up in the 1500 fps range with a 100 grain jacketed or even a 115 cast gas check bullet for a nice flat trajectory with low recoil and the longer sight radius would certainly be of benefit for precise shooting way off.
It would definitely be loud, though.