The weight difference will be so small you'll probably not notice anywhere but on paper. I personally like Seekins and Burris Signature rings. I think Seekins rings on a rail are probably the better bet. I bet you get away with their low rings. I'm running a 58mm objective with Seekins low rings on a heavy barrel rifle with a 20MOA rail on a Savage. Any bigger and it'd touch so that should hopefully give you an idea of clearances with those. No, they're not ultra light but the one ounce or so difference isn't enough to cry over IMHO.