So here's the deal: technically it isn't low magic, just that magic (and it's users) have been severely suppressed by the government. There are magic users but they are few and far between. Any that aren't killed outright when they are seen using it are captured and sent... somewhere else.
So there will be mages, clerics, etc, but he wants them to be NPCs or enemies. I might be able to talk him into something like a magus since they could "hide" their abilities.
The paladin thing is because, honestly, both me and the other guy are pretty fresh at this (we've dabbled in 3.0 and 4e but very little), and paladin rules seem very strict and non "newb-friendly".