Prices are definitely dropping. There was just an auction for a Greek Baby Moondancer (I think only the second ever...maybe the third) that ended under $1000. I think it was $900 something so it was close, and she had a haircut, but still!!
Ponies I have seen sell for $1000+ or would probably sell for around there again:
-Greek Baby: Moondancer, Glory, Blue version of Bluebelle, Cuddles (any), Baby Medley (any)
-Greek Birthday and Ladybird
-SA Moondancer/Medley
The venezuelan ponies would be hard to price, but I wouldn't be surprised if they get up there.