Easier said than done.
Yep. And b/c I am lazy and don't like re-installing stuff; games that I know likely will have DLC and/or will have more patches coming; and any kind of official support - I'm likely not uninstalling those.
Some examples for MysterD:
It was easy to uninstall and back-up something like RAGE PC even despite its 24 GB size - b/c we knew Scorchers was it for DLC; and that Id was moving onto something else. Once I finished Scorchers, off it went.
I ain't removing Bioshock: Infinite yet - they still releasing DLC for that thing.
As for something like Sleeping Dogs, Skyrim + Dishonored - I don't own ALL of the DLC yet.
Vampire: Bloodlines - no way, I love that game too much to uninstall on my current modern-PC. That's my most reinstalled-game ever on my previous PC - that was back in the days, when I was fiending & fighting w/ my HDD for space! Whenever Wesp pumps out a new unofficial patch or Halloween comes around, it's back to Bloodlines for at least a few hours. Ahhhh, I love this game...
I've been coming close to running out of space recently, as well. I don't like uninstalling games either, but there's a pretty easy way to determine what to uninstall and what to keep - it's called the "Will I Ever Come Back to This (Realistically)?" method. Will I come back to Skyrim? check. Bioshock? check. Torchlight 2? Fun game, but not one of my favorites. I'd LIKE to play it again at some point, but w/my backlog, and the fact that it's not a game I LOVED, I realistically probably won't play it again, at least not anytime soon. Uninstalled. It sounds simple, but it's easier said than done. Another thing you can do is wait to install games until you're ready to play them, and then if you like the game enough, keep it installed. If not, get rid of it.
Having game OCD really gets in the way of both of these methods, though. But having limited space and limited funds to upgrade your space forces you to compromise your OCD ways.
Edit: Rogue Legacy is five bucks on GOG right meow, go get it if you want it. I'm waiting for 3.75 doe
Dubble Edit: How do you guys decide what you're playing next? I always have trouble w/this whenever I finish a game, and wind up playing binding of isaac or something for a few hours or something.