There is actually a bit of a difference in a true wavemaker and powerheads and circulation pumps.
For circulation in your planted tank you just need more circulation throughout the whole tank. Sounds like you mentioned dead spots on the bottom, so a circulation pump will do.
As long as you have enough surface agitation to bring in enough dissolved oxygen, then you are fine. You can reposition the spray bar to provide different amounts of surface agitation if you wish.
For circulation pumps, a lot of people seem to recommend Hydor Koralia circulation pumps (they have a mini series too)
For a cheap interchangeable powerhead/circulation pump there is the Marineland MaxiJet line. Only trouble with these is that there are quite a few reports of it making a loud noise (vibration?) in circulation configuration I believe.
I don't know too much about what circulation pump is best (at least the cheap ones), but there are many options to choose from, just research. Any circulation pump should do. No idea on what size/strength either.