I like the SS's, too. I have 16X's on both trainers (how in the world did I end up with 2?) and a 20 on a precision AR.
You might also consider rethinking your max range. The first time you hit a .22 silhouette at 200 yards you'll be hooked. To that end, you may want to consider a rail with some cant built into it.
http://www.diproductsinc.com/Detail....26647&CAT=3600
Dino is right, come to the PD match Saturday and check them all out. You're welcome to shoot either or both of mine.