Go for it! Like you said the price of admission is low. I've never owned a CT90, but I have two CT70's, and they're a blast to putt around on. There's a thread on advrider.com right now of a bunch of guys doing the TAT on CT90's. You've probably read about the guy who rode his from Australia to England. Fun, capable little bikes as long as you're not in a hurry. I think a CT90 would be ideal for your wife to learn on. That's got to be the perfect excuse to get one, right?