You'll also need a return pump, I'd recommend either the Eheim or Mag pumps if you are ok with a submersible... they both work well. Eheims cost more but are quieter.
Mag Drive - Bulk Reef Supply
For a skimmer, a good budget model is the bubble magus NAC3.5+ for your sized tank.
Bubble Magus BM-NAC3.5 Cone Protein Skimmer - Bulk Reef Supply
A better model if you want to spend the dough are the reef octopus skimmers.
For power heads, lots of options. For a budget, the Koralia pumps work well form hydor.
Hydor - Bulk Reef Supply
The nicer ones are the Vortech MP10s... but they are pricey.