as with what most have suggested, keep the P5 and get a miata. I would spend some time on www.miata.net doing research figuring out what year miata i would want and the upgrades i would want to do. The miatas are fun cars right out of the box and it doesn't take much to improve the joy of driving. As for top down in the winter, windows up, heater on, and skull cap on it is quite toasty in there. I've got a few websites for parts and such bookmarked I could send your way if interested