I picked up an ASM G4 a few weeks ago for 120.00, as the person was doing a complete upgrade and didnt want to sell it to the store for nothing. Best skimmer I have had, hands down.
Worst skimmer I ever had was a SeaClone, it didnt skim anything really. I think I could have done better with a plastic tube with a cup glued to the the top and me blowing on a flex hose through an airstone.
Just my two cents, but stay away from SeaClone.
Allen (Aielrond)