Strength and Bulk don't have to go hand in hand

I feel your pain.  I'm 6 foot and the heaviest i've been is my current weight at 155lb.  But i'm also in the best shape i've been.  For recreation type fun I rock climb and thats a sport you wanna stay light so it works out for me.  Before i start slingin advice what exactly is it you're looking for?  Do you want to get bulky? Or do you want to stay lean?  A ton of burst type strength? Or a bunch of stamina?