Im going to go against the social convention and say get a bigger system.
Ok il bend go for the keg, as a few have said once you start kegging you'll want a bigger system anyway, and if you get a bigger system you will get fed up with botteling, so you will want kegs, face the fact, your going to end up with both, but its easier to do a double batch in a small system than it is to bottle 10 gallons