Checkout the ATi BM200. Since your setup is a fish only tank, you don't need the bigger model BM250, BM200 would be a better fit. I say it's worth about $50 over your budget to get a much better performance skimmer than any of the ones you've listed. And the footprint is extremely small, so should have no problems fitting it in your sump inside your tank cabinet.
ATI BM200 Internal ~ $549
Clearance Needed: 13"L x 9"W x 21"H
Dimensions: 12.6"L x 8.5"W x 19.8"H
Energy Consumption: 24 watts
Air Draw: 1,100lph
Suggested Capacity: up to 200g heavy, 250 normal
Minimum Suggested Tank Size: 100g
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