Its going to cost a little more. Mastervolt seems to have a pretty good reputation, so far I have liked my system: Mastervolt separate charger and inverter (didn't make what I wanted in a combo when I bought them, but they do now), three 24-12V convertors for various things, remote panel, PC interface. There are limited programming features with dip switches which cover a lot of normal situations, beyond that you go to the remote panel which allows significant programmability, then the PC interface (its now USB, was serial) connecting to their free software and you can change and query almost anything quite easily.

One big advantage of the Mastervolt is it will draw only a few 10s of milliamps while idling - not like the Prosine which drew 4 amps and ran the fan half the time idling. The Mastervolt draws little enough I just leave it on most of the time. I think the combo units draw more at idle, you would have to check on that. Also the Prosine would never produce its rated charge current (well, for a few minutes it would, then overheat...) while the Mastervolt charger seems to do just what the specs say.