Personally I'd say go with doom, it being a "new" titleIt is a pain, really nerve racking but I really like doing it.
I decided to do it because, I have not seen anything like it before, if it does I am ignorant of it, but I enjoy the game and injecting myself as the character.
Its not what I have been focused on, so I have only 1 playlist so far, I am currently Playing "Black Mesa" the HL2 Mod for HL1.
I have not decided what to do after it.
I have it narrowed down to 3 options though.
-Doom 3
-Metro 2033
-FarCry 1 (2007)