Amanda,
I use mine as a daily driver and love it. The short wheel base, and stiff suspension make for a bumpy ride, but I wouldn't have it any other way. It's like driving a sports car that can go off road any time you want to.
As for problems to look out for; it seems like you're on your way. The window issue seems to happen to everyone at some point in time, but if it's just a slow window it's usually easily fixable. A few of us on here seem to be going through oil more than normal. Sometimes a pcv, egr, and throttle body clean will help with that, but if you just check you're oil at every fill up you should be fine. The stock CD player will sometimes jam and not eject your CD's, and if the VX still has it's original shocks I would check them for leaks.
Other than that the VX is a very reliable car. I would be on the look out for things you would check in other used cars too. Excessive wear and tear on the car, weird dings on the underside (indicating some offroad use), bubbling paint (indicating rust spots), etc.
Have fun with your search, and ask as many questions as you need to (both of us and the seller) to make yourself comfortable.
Welcome to the obsession!
Mark
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless