Grab a half-decent PC, buy humble indie bundles, search gog.com or steam for any other games that pique your interest.

On the one hand you've got indie types like Bastion, Braid, etc. Decent platformers with a few interesting mechanics. And the games/bundles are rather cheap to boot, meaning you can experiment with games outside your comfort zone, and if you don't take to them, you've only spent about $5 - $10 bucks then.

On the other hand you've got higher-profile games like Civ V, Torchlight II, Portal 2, etc. So any interesting, tactical games you've got for console should also appear on the PC. You've also got games like X-Com coming out, games that really only work on the PC.

If you want more help, the Steam thread's always a good place to ask about games.