After putzing around with weights for a few months I want to get serious. I'm interested in size more than strength, and I am interested in total body proportion.

My problem is that my upper body, everything above the waist, is skinny and atrophic, whereas below my waist are very wide & chunky hips, thighs, and legs. I'm like an ectomorph/endomorph centaur. Even when I lose serious weight, my lower body stays big.

My plan is to bulk up my upper body as best I can, but stay away from gaining mass in the lower body.

My question is, should I avoid weight training of the lower body altogether? Or do high volume leg work? Or just a lot of aerobic - running/cycling?