Sorry to bring up a very old arguement that has been hashed and thrashed to death since the first PC game came out, but while watching a DVD of Babylon 5, I think there is a way to "fix" space displays to solve the basic complaint of the horizontal vs diagonal tiles - the unproportional time it takes to get from one "corner" of a galacy to any of the other three corners.
In the B5 "war room" they had a flat representation of the galacy marked off in hexagonal tiles. If PC space games used hexagonal tiles instead of square or diamond shaped tiles a ship would have more tiles to traverse to get from a corner to a diagonal corner than it would to get to either of the other two adjacent corners, giving the game a more "realistic" feel.
Comments?