You failed to mention my favorite, Seirawan chess. I play this with my friend from time to time and it's a lot of fun. And the house of staunton now sells sets with the additional Hawk and Elephant pieces.
Chess960 is also fun. In general I have a hard time getting people to play any variants. They don't want to leave the safetey zone I think.
I been recently looking into chess variants. I mainly looked at beyong chess, bughouse chess, chess 960, chess empire, omega chess, and losing chess. What are your opinions on these and others if you've played them? My favorite one is losing chess.