Where in the metro area....
The 2 shops I recommend the most are MotoBritalia, over in Marietta(Aprilia, Motoguzzi, Ducati, Triumph), and the Yamaha Suzuki Kawasaki shop up in Canton (they're great).
The Canton shop is really great if you buy a bike there. You get a 20% discount on all parts and accessories (not on service though, unfortunately). Really nice folks too. They have a pretty good selection, but not as vast as Motions in Marietta IMO.
I do not recommend Roswell Fun Machines. When I was in the market for a motorcycle and went in there I got the impression that they were a bunch of jerks.
I do recommend the Yamaha shop that someone mentioned in an earlier post.
I have not been to Marietta Motorsports, but I heard that's a decent place.