well, at least IMO, the bioballs aren't worth the plastic they are made from, and I don't particularly care for premade sumps. I find there to be much more room for whatever in the largest glass tank that will fit where you need it to fit, especially considering Petco's almost perpetual $1/g sale. The Skimmer, if new, is $229ish if it's a 110, $289ish if it's a 150. If used, no more than 50% of retail.
So, $200 or so max.
hth