Do you want a hang-on-back or in-sump model?
Do you have room in your sump?
I don't have room in my sump (converted wet/dry) and I have no room for a hang-on-back. I just recieved a Turboflotor 1000 multi which can sit in the cabinet next to the sump. I'll be hooking it up later today (I hope).
Everyone seems to love the skimmer they use but generally downrate the Seaclones.
Red Sea Berlin skimmers get good marks (the classic not the newer turbo).
I'm sure you will get lots of recomendations.
Things to consider are ease of adjustment, cup removal, cleaning and general maintenance of the unit you decide to get.