I'd like to replay some real older games, like Starcraft. Except the resolution is crap, it can't be resized over 1024*768, which is a tiny window, and the controls are janky too. There is OpenRA for C&C enthusiasts but I don't like it much. I replayed Duke Nukem 3d for there is some "refurbished" version.
I liek Tropico 4 which I prefer to 5 and 6 (although 6 is better than 5, but both are less funny). Romance of the Three Kindoms XI (or XIII?), Civ 5, and some others.