If you are the aggressive type, I think doing the 111 all in tactic is your best approach against protoss. I find reapers do minimal damage because once stalkers comes out, your reapers are negated unless you have terribly good micro.
I don't know what league your in but if your in the bottom leagues than a simple 3 barrack push is effective where you get 2 tech labs and 1 reactor on rack. Upgrade stim and con. shell and push in for a timing attack.