Again, going to come down to price and plan. If you're looking at eventually keeping SPS, then you'll need to look into getting higher rated power heads. Decide what you'd like, then look at the pros and cons of each and make a plan.
OP, Basically, my rule of thumb is that you want 2 to 3 powerheads (or wave makers) and you want 40-50x your tank volume. Make sure that you evenly distribute the flow across the sand bed so you don't have any dead spots, and some surface flow to allow for the gas exchange. Are you going to be running a sump as well? Anymore details you can supply will help