Lana,
I'll agree with Liz on this one - do some mroe reading anf research so you can make the decision that you deem best for you. once thing is for sure, animals, especially SPS need water movement. Much like we need to have a car - BUT, what type of car you buy, for example, interior, radio, color, horse power etc, is dependant on the consumer (you).
I used a good return pump (not over the top with flow) and 2 internal water movement devices (TUNZE and
Vortech) on my 180g reef. I had no problem keeping SPS although some hard core SPS keepers would say I didn't have enough flow.
Also, the type of biotope you plan to keep will help determine your max flow needs - is this going to be a Bare Bottom reef? or a shallow or deep sand bed reef? What kind of sps are you keeping? montipora? acropora? seri
atopora? all have different flow needs.
Take a look at some of the members tanks in the tank section and see what they are using - this will help you get a sense what you should want to do.
HTH
House