To keep or sell, serious maintenance problems

[truegearhead]

I'm certainly not new to the used lux car market, and believe it or not the boxster are parts are very reasonable compared to the BMW M parts that I'm used to. My 2002 M3 for example had a $750 water pump fail! I'm also religious about preventative maintenance. The thing about the Porsche that I hate (when compared to older BMWs I've owned) is that the Boxster keeps getting me stranded. Waterpump, shift linkage, ignition switch all left me dead away from home. I think I'm going to keep the car because I really do enjoy it! I need to identify what else could fail in the next 20,000 miles and then go ahead and replace it. The wheel bearings are a great place to start. Any other suggestions?