the bubble magus NAC6 @ $138 is a better skimmer with more power and better design features than the vertex in- 100.
NAC6 has a mesh wheel impeller, comes with a spare,
gets 500lph air injection (in-80/in-100 get 420lph),
has a wider neck than the vertex, has the pump in the body for smaller footprint, and has a better pump than the resun on the vertex, so all in all a better skimmer for less money.