EPO's won't make the boat any faster really, they handle nicer but I don't know about faster. They slice through the water a little cleaner because of the shape, and you'll have less slippage. Hobie1616 has the right idea. Make sure everything on the boat it correct and then sail it. Fancy equipment will only take you so far and thats not far. I know I've thrown alot of money at my boats. You'll get far more out of learning the boat than you will by adding parts.
I like the epo's but if you're on a budget its not a good place to spend money. The 20 style tiller connectors are nice, but no speed gain over a tight set of regular connections.