This is a very topical thread as our P5 is aging as well and looking at similar criteria.
After looking at all of these, I've also looked at the following:
IS300 - too bad the sportcross is auto only. We could do a sedan, and one with lots of life left are around $10. Import Queens IS was a lot of fun.
HHR SS - Some may put these into the minivan category...or the ugly category. In SS guise, I love 'em. And rrocket always talks of how well the cobalt SS handles. Low mileage, recent examples can be had for around $15 .... in the US. If they brought these into Canada, it was in very limited numbers.