aqua c ev 120 is for a 120 gal max, and those skimmers aren't that good imo. Think Reef octopus is the best bang for buck these days. Would also get an internal skimmer. One that sits outside the sump is a flood waiting to happen.
check linky http://www.reefoctopusskimmers.com/octopus-products.html
BRS is a good place to lookas well. Good prices and they only carry skimmers that'r tried and true.