Welcome to O.T., BTF!
"Best" is a hard thing to answer. "Best" to me means that the mounts allow the scope to sit as low as possible on the rifle, the rings hold the scope securely, and the design doesn't impart stress on the scope. Looks are also important to me, but aesthetics is a subjective thing and takes a backseat to function. Any quality name brand scope mount design has mounts available for the Savage 12 and 30mm tube scopes. Some of the best brands include, but are not limited to: TPS, Badger, Seekins Precision, Nightforce, Ken Farrell, Talley, Warne, S&K, Conetrol, Leupold, and Burris. There are others as well, but these are just the ones that come to mind. The first 5 are "tactical" style rings that are extremely strong and make a very rock solid secure installation that will likely withstand any punishment you're likely to dish out. The last 6 are "hunting style" rings that are all still very strong -- strong enough for all but the most extreme use, plenty strong enough for a typical hunting rifle -- yet are lighter, sleeker, & trimmer looking than the tactical rings and will often allow more mounting height options to get your scope as low as possible on the rifle. These rings are also generally narrower than the tactical rings, which may be helpful when mounting a scope with a short tube length. It is always best to mount your scope as low as possible to permit proper cheek weld and natural alignment between the scope and your eye when you throw the rifle up to your shoulder. Actually, Warne, Burris, and Leupold also make a line of tactical rings as well, but most of their rings are the standard "hunting" styles. "Tactical" rings are characterized by additional width, more and stronger screws, and more robust design overall. Do a search on each of these brands to see their product offerings.
Edited by RifleDude