I now played Quake and both of the expansions Scourge of Armagon and Dissolution of Eternity. Still found some secrets that i did not know about :). Next up is Quake2 and all its expansions and then Quake 4. No point in playing quake 3 as it's really only a multiplayer game :).
...ohhh and then i will code a little on ZeroFps also ;).