The ASM brand skimmers are excellent. They're a copy of the design of a EuroReef Skimmer which has long been well regarded in the hobby. There are some higher end skimmers as well, like the Deltec skimmer that you might want to look into as well. The G5 is rated to 700g which is pretty close to the number of G that you have in your system. I'd probably shoot for the G6 instead. That gives you a skimmer worth almost 2x the number of gallons in your system and should work like mad! (I'm looking at the G3 which is supposed to be good for up around 200g and I'm running a 120). I'd rather over skim then underskim as I like a well stocked aquarium.