I'm not sure how good that one is form Petco but the first one I bought from them was horrible. I have 2 Hydor Korlia Nano 425's in my 30 and to be honest I think I may need more flow. It all depends on my return when i finish my sump.
I got mine from an online from Big Al's for $26 each (sale). If you search you can find them.
I like the Korlia's since they give off a more dispersed flow instead of the jet like most powerheads.
Check out the Evolutions. Someone with more experience can tell you if one 550 or 750 would be enough. The link is for reference and you may be able to find them cheaper.