Howdy,
I have used alot of different types of skimmers and have found the following:
Red Sea Berlin (original) - Works well on smaller tanks (upto 75g)
Red Sea Prizm - Peice of crap, way too noisy and very finicky
Sea Clone - Worst skimmer ever!
CPR BakPak - works well for tanks upto 60g
AquaC Remora Pro - BEST HOB skimmer ever!
AquaC EV150 - One of the top sump skimmers around
EuroReef CS6-3 - Best skimmer ever!
Das BX-2 - good sump skimmer but overpriced
ETSS 800 - Mine broke in transit, so I just returned it.
As you can see, I sort of have a skimmer fetish. I don't necessarily need all the skimmers I own, but I sure like to try out different ones to see which is best.
I am planning on getting a MTC HSA skimmer next because I have heard great things about them. I will probably go with a EuroReef CS8-1 with dual pumps or a large AquaC EV series for the tank I am planning right now.
All I can tell you about skimmers is, you get what you pay for. The other piece of advice is, always buy a skimmer that is rated for a bigger tank than what you have. You will undoubtedly upgrade tank size, so think ahead when buying the skimmer.
Peace.