Ok, first off: Dreamcast is not old school. It is current gen. It just died quickly. Secondly, you are missing quite a few very nice choices there- 3do, Saturn, Neo Geo, and Turboduo among others. Personally, my favorite console (other than the xbox) is still the turboduo. Extremely overlooked system with many wonderful games. Granted most of them are not cheap now, but it's still the best of the best. Saturn is a very good choice as well. However, if you omited these on purpose... From what you listed I would say N64. I didn't really like it at the time (due to the choice of format), but if you've not played mario 64, among several others, you really should. Also most of the good games are really cheap on it, unlike some of the other systems.