I'll disqualify myself from naming any of my own designs.
I suppose a few of my faves would be:
Luna - Destination Moon
Pan Am Clipper - 2001
1701 Refit - Star Trek
Discovery 1 - 2001
VF-1 Valkyrie - Macross (along with most of the variants from Kawamori-san)
Sol Bianca - from the anime of the same name
Star Leaf - Gall Force
Millennium Falcon - Star Wars
Rick