Hmm... First is almost a tie.... Either my boss' 2003 Nissan 350z 6-speed or my friends '96 318 5-speed. The Z pulls like crazy, and loves to be pushed. The exhaust tone is one of pure lust.
2nd would have to be my dad's '86 Chevy Nova 5-speed. Laugh all you want, but when you push through a mud hole and don't get stuck, and the person behind you has to get you to pull them out, you'll understand.
3rd Would have to be a tie for my boss' 2003 Mercedes E-320 and his 2006 Navigator 5.7L.... The E-class has the panoramic sunroof *drools*, and the Nav just has that punch that would break the tires loose at any speed.
4th Would be a tie between my uncle's 2005 'stang GT 5-speed, my CRX, and my buddy's '94 Z-28 6-speed. Oy. The Z-28 kicks the 'stangs arse, but the 'stang is still fun to drive, and my CRX is still kicking, so it's always fun.