well i'm gonna have to agree on the peak thing; i believe that's pure genetic. but i've always been particularly fond of these three exercises, these worked really well for me when i first started out when i was 13 (but then again, most things work well for you when you just start out and do them right):
standing alternate DB curls
hammer curls
concentration curls
hey buddy, couldya explain to me how those are done or give me a link to where it's explained/illustrated? I've been hearing a lot about them lately and i could use something new.
spider curl - grab barbell and use the preacher bench the opposite way by placing your chest against the incline side and hang you arms over the side where the seat is. Similar to doing a concentration curl, only with a barbell.