You don't have to completely stop lifting weights. A lot of people don't really do this stuff yet, but I've been experimenting with THERABANDS, doing most lifts I would normally do with weights using them. I've become faster and stronger, plus more flexible without gaining to much mass, just try it if you also have a passion for lifting, this sh** works.
Thera-Bands -- 6 Foot Lengths and 50 Yard Rolls - YogaAccessories.com