I have not had a chance to play Pathfinder but I have heard good things about it. I had fun in a somewhat recent one-shot CoC adventure where I somehow managed to survive without losing too much sanity or dying.
I still have the 1E Gamma World book, the 3E box set, and pretty much all the official stuff for GW 4E--4E was my favorite out of the early editions.
I don't get to play boardgames as much as I like but I still have my old Avalon Hill games--including Dune and Magic Realm.
I would like to eventually run Talislanta 4E and The Savage Land. I just got the D&D 5E OGL version PDF of TSL but I still like the classic Talislanta rules version better. We are still waiting on the Open D6 version to come out so they can get started on getting the print versions out and I can get my print copy of the classic rules version.
Another game I would not mind running would be a classic BECMI D&D game.