About to buy some powerheads, and I would like some advice for a 55g.

[gregzz4]

Sure, it would be fine, or some el-cheapo pump, or a Tunze, or whatever
Or one nice pump of your choice, and one cheapo for now .... whatever ...
Nobody said you had to decide on the pumps right now, did they ?

Small, cheap pumps will do the job, as long as you don't mind the look of them

They just don't create the random flow you'd like to have later in your reef ....