I hate to dig up old games, but Diablo 2 is still the best game out there because it's so replayable... though I stuck with Single Player... battle.net has gotten really crappy.
They're selling the whole package at stores for $40 US. Diablo1, and Hellfire expansion, Diablo2 and Lord of Destruction Expansion. If you've never played it, it's a must. I've never been one for First Person Shooters, so Diablo was a great game... and it came out during the whole FPS craze of Wolfenstein, Doom, etc.
Starcraft is way cheap and a great game... just remember "Power Overwhelming" [img]redface.gif[/img] )
And for everyone else out there that wondered what ever happened to older games and don't know where you can get them... most of em, you can download for free at
http://www.theunderdogs.org
It had 2 of my old favorites, WAsteland and Mines of Titan. You can see a lot of where RPG's came from. Though be careful, a lot of them are DOS only. (And they don't work great on Windows NT's Dos emulation)