If long lasting rear tires is all you're after, just buy the tires with the highest treadwear rating and get an alignment. It was said earlier that you could get another set of 17" wheels and run the same size all the way around but you don't need to buy another set of wheels to do that. I have a 2004 Boxster with stock 17" wheels all the way around and in the winter I run the same 255mm winter tires all the way around and have not experienced oversteer, I do run staggered tire pressures, though. When the rears get worn half way down just get the tires swapped on the rims, front to back.
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