Just to make sure that you did mean this Concordia and not the one from WC II (which I think is far superior)
As for my own list, aside from whats been mentioned here so far, id like to add a few hear and there:
The Battleship from Project A-Ko: Part Yamato, Part Arcadia, Part Zentraedi, and part every other cool ship from anime lore. Not to mention it makes a handy amusement park and hotel.
Dogos Giar from Zeta Gundam: One of the few Gundam ships I respect as it carries a decent armament and more than say 4 mobile suits.
Queen Emeraldas from Queen Emeraldas: Gotta love a ship which looks like a Zeppelin with a 17th Century Man-O-War on the bottom.
Lean Horse Jr (Reinforce Jr) : Whatever you call it you gotta love a ship with a giant Beam Saber attack.