[David N.]

300zx, good choice! I hope you got the twin turbo. Insurance companies probably don't like it because it's roughly 100 more hp than an early Boxster (pre-00) and bought more as a sports car (rather than maybe more of a showy car as the Boxster is I think). It's an awesome car tho, one I seriously considered because it's quite a bit of bang for the buck.

Anyway, to address your question, biggest help to reliability besides checking history and doing PPI (search threats on this site for boxster purchase tips) is just to look for fewer miles and a car that feels like it's been treated well. Cost to own and reliability go hand in hand, but if you just do your homework and make sure you like what you are buying, then a boxster shouldn't be too much more than any german sports car. Oil change is 9 quarts, tires can be a bit pricier. I'd keep some money away for the occasional MAF or O2 sensor (again check this site for details), but otherwise enjoy.

Welcome to the site!

-David