The Sega Dreamcast is, by far, the best console ever. It has the most comfortable first party controllers ever designed, as well as tons of great games. The graphics, while slightly outdated now, were at the top of their game when released and can still rival the Playstation 2 pretty easily. The memory system was nice as well, for the VMU?s could be used on their own to play minigames (even if very few developers took advantage of that.). The community built around the Dreamcast was awesome as well. You can get tons of emulators (NES, SNE, Genesis, Playstation), as well as home brewed games and utilites that allow you to play MP3?s and VCD?s, among many other things. Of course, due to hardware propaganda and commercial conditioning, Sony was able to beat Sega (and later, everyone else) out. It?s too bad really, I would have loved to have seen the DVD attachment for the Dreamcast, as well as all of the awesome games that were cancelled once Sega sold their fans out?

I wouldn't really call the C64 a game system.  
I half-remember one of the RPGs I was playing on that.  I never did solve it  About all I remember about it is that there was a ju-ju bag.  I never did figure out what to do with it.

I'm a big fan of my SNES still. It's hard for me to pick a favorite, but since you're making me, that's what I'm gonna have to go w/. I also loved my NES (til my brother sold it, the bugger) and my Genesis. I loved my PS2 ... until it broke. I've never played a GC, N64 or an XBox. So I can't say about those. Nor have I played an Atari. *shrug* I did at one time have a Dreamcast, but I hardly ever played it, so I sold it to a friend who kept begging me for it. So it is getting its good use. hehe

I could only put ten choices, sorry