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 I've owned many hang on the back skimmers.  I tried the prizm pro, the coralife 250, and the remora aqua-c.  I had the best results with the remora; however, recently I've seen a Deltec hang on skimmer and it was working really good.  I didn't have muck luck with any of the hang on types.  I would always recommend getting a sump, it opens up way more possibilities for your skimmer.  Good luck! 
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90 gal SPS display+65 gallon mixed reef 
GEAR: Korallin calcium reactor, bio pellets, digital aquatics controller, Tunze ATO, MP40, 4 x Tunze 6105 w/controller, Reef Octopus Xp3000 ext, 2x250w MH, Futura LED.
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