So I've got a 2004 Fuji Finest road bike that I'm using in my triathlons. I'm averaging somewhere in the 16 mph range pretty consistently, but would prefer it to be a bit faster. Since I don't have enough to buy a new bike, I'm looking at upgrading this one. I'm trying to decide between getting some aerobars or getting some clipless pedals and shoes. I only have the money to do one or the other right now, so which one would give me more improvement speedwise?