Here's an idea - Aspyr's "Lost Classics" series, games that were never ported to OS X as well as a few classics that never made it to the Mac, value priced at $19.99. Deus Ex and Alpha Centauri could be part of this line up, as well as older PC games that would be great to have on the Mac: Half-Life, Planescape Torment, Thief, Grand Theft Auto, to name a few. I'd buy them all. Really.
I know it's an unrealistic for zillions of reasons, but hey, a guy's gotta have dreams
Work: MacBook - 2.4 Ghz Core 2 Duo - 4GB RAM - X3100 graphics.
Home: Mini - 2.0 Ghz Core2Duo - 2 GB RAM - GeForce 9400 graphics.