I have the S&W 317 - the 10 oz, 1 7/8" aluminum version. I bought it as a practice companion to the S&W 340 .357 Mag. I put Pachmayr Gripper Decelerators on it to match the 340. I've come to really like this little revolver. You can really make it hum in double action mode. It's really a lot of fun. Because of the weight and barrel length, it is pretty hard to shoot, but makes you concentrate on fundamentals -- sight picture, trigger control, and follow through.
The .22 ammo I use in it really isn't very accurate, but for my purposes it's fine -- Mostly steel plates and steel popers (human sihloutte, Sp?). The sights are bright silver (aluminum) -- used a permanent marker (from Wal Mart) to black both front and back -- this really helped.
The 3", adjustable sight version might be just the ticket for "plinking".
http://www.swfirearms.vista.com/store/index.php3?cat=293480&item=831378&sw_activeTab=1
I don't have any idea about the durability of these aluminum .22's.
Also have a model 34 -- 4" J Frame, Blue Steel version -- it also has the Pachmayr Grippers. This revolver is a lot easier (vs. the 317) to shoot accurately.
Years ago, had a K-22, 6" -- absoutely loved that revolver -- Loaned it to my brother when I went in the service -- Alas, it was stolen.
Also had a Dan Wesson .22. -- Bought it for the accuracy -- it never proved to be any more accurate than the 4" J Frame M 34 mentioned above and it weighed a ton.
Had a Colt Python (Similar to Diamondback) -- Action is much overrated IMHO. I wouldn't pay premium for Diamondback -- I like the S&W action (and Ruger for that matter) better -- but that's just me.
If I had to choose just one, with no other influences (i.e. 340 companion), I'd go with the J Frame M 34 4" with Pachmayr Grippers -- very portable, as accurate as any, adustable sights, reasonable weight (and just plain fun to shoot) -- why this model was discontinued is beyond me.