Is there any particular reason you're asking about a powerhead? Do you plan to run a sponge filter or something through it?
If it's just to create some current, you've no reason to have it in mind. Any suitable mechanical filter that you choose will give ample current for oxygenating the water, and none of the fish you have listed on there require any serious supplemental current that would necessitate a powerhead.
They're generally for reef systems as wavemakers, or to run certain sponge filters or UGFs. Other than that, no reason for one.
Use the money on something else. Hope that helps.