i have a seaclone 100, wouldn't recommend it, it works well but takes a special touch. i also have a remora, works great, easy to use, but it does skim on the wet side. oh and use the maxi jet with it, not the rio.
I like the Deltec. When I had my 20G, I was running a Deltec MCE300 and it pulled out dark green smelly skimmate. Although the MCE300 is rated for a 90 gallon at normal bioload, I would go with the MCE600. But they do cost a fortune.
I have the Remora pro and it works well. but it is pretty noisy, check the inland reef forum, some guy was selling a pretty much brand new Bermuda rogue wave skimmer for $199 obo.
Aqua Medic Turboflotor 1000 Multi, bermuda rogue wave, deltec mce600 (but find a used one as they are $$$) Aslo Aqua Medic just release the Turboflotor Blue 3000 which is supposed to be one of the highest air flow?