Well, my skimmer is a little different (Aqua C EV-240). It's a bit more maintenance then a typical skimmer, have to check the injector for debris, and because of the taller then normal neck, I have to clean that more often. Once a week I wipe down the inside of the neck, and about once a month, I completely remove the skimmer and hose it out.
An important thing to consider, is expansion. The Eshopps PSK 150, actually has a footprint of 12"x6". If you like removed the pump, and then turn the skimmer sideways above the sump, you might be able to get it out. That skimmer is fine for 125gal for now. But in my honest opinion, it would only support a lighter bioload. If in the future you wanted to upgrade your skimmer, or have more support equipment, say a phosban reactor, the shorter tank would make that easier.