Let's see. I think I'm just going to list everything, because I pretty much worship anything that was created during the golden age of the genre. This is just going to be Toho kaiju only, with the exception of Guilala, because the list is probably going to be long as hell as it is, and throwing in the Gamera series just means I'm going to spend more time on this than I care to.

So, in no particular order (except chronological):
Shodai-goji (54)
Rodan (56)
Moguera (Mysterians robot)
Varan (58)
Mosu-goji (GTTHM style)
King Ghidorah (64 & 65)
Baragon (65)
Gaila
Sanda
Daisenso-goji (Monster Zero & Sea Monster design)
Rodan (65 & 68)
Mechanikong
Gorosaurus
Guilala
Shoshingeki-goji (68 to 72)
Gezora
Hedorah
Gigan (72)
Megalon
Mechagodzilla (74 & 75)
Titanosaurus
Megaro-goji (73 to 75)
King Ghidorah (91 biological and mechanical)
Moge/Desu-goji (94 and 95)
Spacegodzilla
Death Ghidorah
Grand King Ghidorah
Mire-goji (both styles)
Soukugeki-goji (GMK)
Soukugeki Baragon (GMK)
Kiryu-Mechagodzilla (both styles)
GFW Angilas
GFW Gigan
GFW Godzilla
I like some other ones as well, but these guys stand out the most for me.
"EVERYONE FORGET YOUR TROUBLES! ENJOY YOURSELVES!THERE'S NOTHING TO WORRY ABOUT!" - Gigantis The Fire Monster
"It was HUGE...It was...IT WAS LIKE A MONSTER!!! Suddenly the rocks rose...ALIVE!" - Godzilla 1985