If they have proof of the maintenance, then it should be okay. There's a lot of preventative stuff that should be done by 200K, like water pump, thermostat, coolant resevoir, powersteering resevoir/filter, idler/tension pulleys, transmission and diff fluid, suspension bushings, etc.
It's almost better getting a car that hasn't had all that stuff done for cheaper, then doing it yourself to make sure it's been done right.
As for winter driving, you don't need an Xi. With a decent set of winter tires you'll be fine. I've never had an issue, except if you get cocky and try to go through snow drifts that are too deep, but an Xi won't help you if you're beached.