Boxsters should be easy to find on cars.com or cargurus. The S model is more power, and usually bigger brakes. If she doesn't care about going fast, don't worry about an S, the base cars are WAY cheaper.
Good years vs bad years is totally subjective. Arguably the best years are like 2009-2013, the 987.2 generation. The earlier motors were problematic with IMS bearings, and the later cars switched to 4 cylinder motors.
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