Strength
Well buddy, you should try bodyweight exercises, look at Pavel on Dragon Door, he is very strong but not too big, lifting weights increases bulk but bodyweight exercises increases strength and toning.
When I was lifting weights I put on a few stone then I stopped and started boxing and bodyweight exercises, I lost some fat and stayed at a similar weight but I am far stronger now than when I used to lift weights even thought I have not put on any size.