If you haven't played Sins of a Solar Empire, which is an innovative space warfare 4x-RTS, then this is your chance. It's currently available for $10 over Impulse (which is like Steam).
This game is a lot of fun in both single player and especially in online multiplayer and it is DRM-free. (The only DRM is that you need to have a legit and registered CD-key in order to update it via Impulse to the latest version.) If you buy the game, be sure to visit the Sins discussion forum:
Last I checked, gogamer.com had the Game of the Year edition for $18 + shipping.
However, I don't see any reason not to purchase it as an Impulse download. You need to download and install Impulse anyway in order to patch the game to the most updated version (which you would want to do) and to be able to play it online and to later purchase the Entrenchment expansion if you decide that you like the game. The GOTY doesn't have any extra content as far as I know and I don't see any advantage to getting a physical copy other than to have the box and the CD. (As long as you keep your CD-key around you can always just d/l and install through Impulse.) Impulse is very benign and unobtrusive, btw. It doesn't need to be running in order to play the game and you can set it so that it doesn't load at startup.
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