I bought a 3 x 9 burris which I love, as well as a 3 x 12. Thr 3 x 9 is no longer made, and can be had pretty cheap if you shop. One thing to remember about high power pistol scope mounts is that their vertical zero is a kind of comprimise on contender and encore barrels, averaging the anticipated recoil.
For instance, a 223 recoils a lot less than a 308. Therefore with the vertical adjustment set dead center (i.e. the same number of clicks to stop both up and down) the 223 will print low and the 308 will print high.
Use signature rings with offsets to fix this, and you'll be very happy.