I think you have a good handle on it already. For the type of riding you want to do, I think either the Electra or any other cruiser/comfort bike would be suitable. I've never ridden an Electra, but it seems like the "flat foot technology" would be nice for a novice. But none of the bikes you're thinking about would be dificult to ride. If you really love cycling, you'll probably trade it in on something faster in a few months.
If Davis is like most campuses, you'll want to spend more on a good lock than on the other accessories. And don't park near the bars. Drunk kids love to kick in bicycle wheels, for some reason.