Yes, another wheel question, another tire/rim width question.

I'm considering some new wheels. Currently riding 700x23 tire but probably will look at 700x25 when these run out (or might even get crazy and get 700x28). But all the talk of optimum rim width to tire to psi to rolling resistance is starting to confuse me. But basically I'm trying to decide if I should get 23 or 25mm rim that would run 700x23 tires now and maybe larger tires later.