I think most people shouldn't be concerned with "getting too big" when they start lifting weights or use that as an excuse not to include some weight work. After all, if it was that easy to build muscular bulk I think there would be a lot more people strutting around with 21" biceps :) Obviously you will gain muscle mass when you lift weights, but if you balance your workout to include the core compound exercises and not overemphasize any one exercise, then all your body parts should grow at basically the same rate. You'll get bigger, but it won't appear unaesthetic because you'll be balanced. The problem arises when people do nothing but bench while they're walking around on bird legs. They look like they have too much muscular bulk up top when in reality they just have too little on the bottom.