Leupold makes some good bases as are the DNZ Game Reaper mounts. There are really several good choices out there. The Burris Zee rings are also great. Steel rings are probably the best, but I'm not had problems with quality aluminum rings either.

I like the Weaver style bases and some of the rings are okay. The rings that hook on one side then have two screws you tighten down on the other side suck. Other than those the normal rings are good from Weaver. The problem with the ones mentioned above is it's very very hard to get a scope centered with these. When you tighten them down it wants to turn the scope. They do seem to hold the scope secure, but it's nearly impossible to get the scope level.