Marty Blog digs up 6 classic PC games that can be found on Steam for $20 or less. Each game is given a quick description and recommendation. A few extra games are given the stamp of approval at article's end.
Hard to say, but I think I spent the most time with Deus Ex and GTA: Vice City (best game in the series, barring GTA4). I think I'd have to go with Deus Ex though, as I really like the blend of FPS and RPG elements.
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