i know the Z has more power but i hear about alot of problems with reliablity and other things. im aiming for the 20k mark so i can get a Z for pretty cheap. however, the is300 5 speed is much more appealing than the Z for everything but power. obviously the Z is more powerful but u cant go wrong with a lexus. besides, the Z is everywhere and im much more used to the toyota engine. what would u pick?