What is your favorite 4X game?

[Razentsu]

Civilization III was my first, so I'm going to go with that.

 

[Evil Smurf]

Alpha Centuri is a favourite game of mine behind Bastion

 

[Aeshi]

Star Ruler

X3 might also count as a 4X game, albeit one where you yourself control a unit as well.

 

[Violator[xL]]

Galciv 2 is pretty good but I sometimes miss the array of special devices that you could fit onto your Masters of Orion 2 ships, like cloaking, displacement devices or black hole generators. If they'd ever combine something like that into one game, I'd be sold.