I have to agree on Leupolds being the best out there. I have become a fan of fixed power scopes myself. I recently added a scope to a shotgun for the first time. I got an fx-II 4 power leupold in wide duplex. The two things I like best about it. First it has a little longer eye relief which is really nice for the kick. Second the wide duplex is easy to pick out fast. The great thing with the leupold is that it is strong enough to handle the extra recoil and if it breaks, the warranty is unbeatable. I got mine here:
Leupold fx-II