On a build I just recently completed, the customer bought a Burris XTR Xtreme Tactical 4-16X50mm. Wow, a heavy-duty piece of optical equipment. Only thing I really didn't like about it was the 1 MOA elevation adjustments. But it's not my scope, so why should I care?
One I was also pleased with was a Bushnell Elite 8-32X40, although as the day started to dim, the scope got pretty dark.
Another one that really surprised me was a Konus M-30 8-32X52. Really good quality glass with a little pizzazz.
Then of course, there's always the L guys. I really like the Leupold FX fixed power scopes, and they come from 6x all the way up to 45X.