[Gregstrom]

Just realised I never put what I'd like to see into this thread.

I'd like a game with a great depth of tech tree, so that you could go from something near current technology to the very heights of space opera if a game went on long enough. I'd like to see a slightly different tech tree each time I play, to keep things interesting. Special-case technologies that aren't part of the standard tree and require odd trigger conditions would be great.
The ability to choose from a great range of galaxy sizes would be awesome and let me control the likely duration of the game.

And ideally I want a game that loses nothing in PBEM, so self-resolving combat where I can make meaningful tactical input in the form of battle plans is essential, as is the ability to watch said battles in spinnable, zoomable cinematic detail.

I may be asking for rather too much, of course.