Hardcore Gamer: Shattered Horizon is an FPS with a huge twist - you're flying through space. Also, going through corridors, but seriously, it's a zero-g FPS. Nuclear Dawn is a stealth-ish FPS, while Two Worlds II is more for RTS fans. Planets Under Attack has giant circles full of things doing things to other giant circles with things, but it's impossible to tell just what kind of game it is based on gameplay footage. It's got a neon-heavy color scheme, so if you've finished Blood Dragon and have a thing for that right now, maybe you'll dig it.