Monster Zero x SciFi Japan - Archive Only

I got thinking about this yesterday as I finally watched for the first time my copy of Godzilla Vs The Sea Monster which came out awhile back. I simply could not and still can't believe how INCREDIBLE the print looked! I mean honestly I caught myself looking at the picture instead of watching the film because it looked as if it was shot yesterday. It's shown exactly what technology can do these days, especially considering the movie is over 4 decades old now.

With that in mind, I am asking all you guru's out there to help me get together a list of sources or information on prints that were used for various Godzilla DVDs. I would particularly be interested in where the prints from the following came from:

-Sony
Godzilla Vs The Sea Monster
Son Of Godzilla

Tristar:
Godzilla Vs Hedorah
Godzilla Vs Gigan
Godzilla Vs MechaGodzilla

Universal:
King Kong Vs Godzilla (and why Toho didn't restore their film, both for this and their own release)

EDIT: Here's our movie list again:

Godzilla - Classic Media
Godzilla Raids Again - Classic Media
Godzilla vs King Kong - Universal
Godzilla vs The Thing - Classic Media
Ghidrah, The Three-Headed Monster - Classic Media
Godzilla vs Monster Zero - Classic Media
Godzlla vs The Sea Monster - Sony Tristar
Son Of Godzilla - Sony Tristar
Destroy All Monsters - ADV
Godzilla's Revenge - Classic Media
Godzilla vs Hedorah - Sony Tristar
Godzilla vs Gigan - Sony Tristar
Godzilla vs Megalon - "Unknown"; Toho
Godzilla vs MechaGodzilla - Sony Tristar
Terror Of MechaGodzilla - Classic Media
Return Of / Godzilla 1985 - Lakeshore, Anchor Bay (could be wrong)
Godzilla vs Biollante - Miramax
Godzilla vs King Ghidorah - Sony Tristar
Godzilla vs Mothra - Sony Tristar
Godzilla vs Mechagodzilla II - Sony Tristar
Godzilla vs Space Godzilla - Sony Tristar
Godzilla vs Destoroyah - Sony Tristar
Godzilla 2000 - Sony Tristar
Godzilla vs Megaguirus - Sony Tristar
Godzilla, Mothra & King Ghidorah - Sony Tristar
Godzilla Against Mechagodzilla - Sony Tristar
Godzilla Tokyo SOS - Sony Tristar
Godzilla Final Wars - Sony Tristar

All sony/tristar dvds except for Godzilla vs. The Sea Monsters are remasters from international prints. I have no idea about Godzilla vs. the Sea Monster (maybe they just switched around titles so people would recognize it as a Godzilla movie?)

Universal's print was one that they restored from the American version and were previously used in festivals etc.