Two giant TRANSFORMING robots battling a giant monster!
ROBOTECH VS. MOTHRA! or maybe GRIMLOCK VS. GODZILLA would be awesome. Just don't let Michael Bay anywhere near it!
Hirohito Gamera! Hirohito Gamera!
I'm not the hugest Kaiju fan, but I did spend many a Saturday afternoon back in the 80's watching Creature Double Feature on WLVI in Boston, and I remember Kaiju Big Battel getting pretty popular around here in the late 90's/early 00's.
I've yet to watch Cloverfield, or Super 8 for instance, but I did watch the Aquabats! SuperShow! which is awesome, but it has mostly smallish monsters except for some giant ants, the Floating Eye of Death, and in the last episode where they fight Space Monster "M"(so EPIC). I still thinks it's amazingly cool the way they had the last live-action episode of the show lead right into where the cartoon part begins in the first episode, and the last cartoon ends where the first live-action episode begins. I can't wait for season 2!