[husker boxster]

Short story - match your rears.

Long story - you should never have mis-matched front and rear tires. Their characteristics will be different, resulting in unusual (at best) driving situations. You could end up with unpredictable results in rain or high speed driving. It is dangerous to have different tires on the front and rear of a high performance sports car.

Check the manufacture date on your rear tires. If they are 6-8 yrs old, it's not worth matching to them as they're getting too old for high speed driving. You're going to need a full set if the rears are old.

If you need a full set of tires, there are plenty of threads on this topic. You need to decide what fits your needs. There are plenty of inexpensive tires that work fine on a Boxster. There are plenty of mid-level priced tires too. And Michelin and Continental are just releasing new tires on the upper end of the price scale. Search on tires here and go to TireRack for lots of information.