Probably the PS2. I didn't own a console last gen either, though my little sister and a friend had a Gamecube, so I was able to play a handful of games I would have wanted to play (most acutely: Windwaker).
Still, the overall number of PS2 games I loved...I played it a lot at friends' places. God of War, Tiger Woods 2005, NBA Street vol. 2 and 3, Shadow of the Colossus, GTA III: San Andreas, Katamari Damacy...good times.
Back in the day I jealously wanted an NES, but all I had was an Atari. It was ok, though, because once I got the SNEs I also got Super Mario All-Stars, and that was a huge chunk of the games I wanted to own. And in my 11-year-old's thinking, Link to the Past was better than the original Zelda, and Super Metriod was better than Metriod, so it was all okay in the end.
My consoles and the fates they suffered:
Atari 7800 (Sold), Intellivision (Thrown out), Gameboy (Lost), Super Nintendo (Stolen), Super Nintendo (2nd copy) (Thrown out by mother), Nintendo 64 (Still own), Super Nintendo (3rd copy) (Still own), Wii (Sold)
A more detailed history appears on my profile.
