I can't believe I'm contributing to this retarded (and crossposted) thread, but I've always liked the cupholders in my Maxima. There are two in the front, differently sized. One fits a can/20 oz soft drink cup, and the other can fit something with a slightly larger base like a thermos or plastic bottle.
And, if that's not enough for you, the two cupholders are actually a single plastic insert that comes out, so if you have something with a really big base like a coffee mug or Super Big Gulp, just take the insert out and you're all set. It may sound like a PITA, but I rarely take mine out since I don't often travel with a liter+ of soda. :)