Battleship Yamato in Gunbuster
I can NOT believe I didn't spot this years earlier, but in the 4th episode, when the Excelion does the sub-space warp, among all of the ships that also warp - the Space Battleship Yamato ( aka: Argos from Starblazer ) makes a special appearance.
The scene: http://www.flickr.com/photos/ebola8mystinkymonkey/6041646573/sizes/l/in/photostream/
For reference: http://www.flickr.com/photos/dariobt/5410077397/
" I may not like what you do, but I will defend your right to do it "