What size tank? What's your bioload?
From what I've researched:
Stay away from Prisms & SeaClones.
I like the Remora Pro myself, since its highly recommended by the wetwebmedia crew.
Always remember that manufacturers almost always overstate the max. size tank their skimmers can handle. eg. Prism Pro will do 50g but it states 300g. No HOB skimmer can do a 300g as far as I've heard.
Like I said, these are things I've read & heard in my research since I just picked up my first skimmer (Tunze 320 from Justin - You Rock Justin)
I'm also supposed to be buying a Remora Pro from another Canreefer this week. I'll let you know how it performs after I set it up in my tank. Real world experience trumps secondary research every time.
HTH
Anthony