road triple crank with shimano flat bar road FD r443 would get you what you desire. Do that and throw some road slicks on there while your at. check out nashbar for an inexpensive road crank and bottom bracket and hvae a blast. you can do this upgrade for about $120 if your capable of doing the labor yourself. if you have to pay an lbs probably looking at 15 or 20 bucks for them to swap the cranks for you