Have you considered Thornhill's Vienna II? Retail $995, but I've seen used much cheaper. HDR has a couple of models, too.
A brand I'm not familiar with, but I had a friend who worked with this place for trying to find a saddle that fit. She said they were very helpful.
Meyerstone Dressage Saddles
For used, I've always thought that UsedSaddles.com, Pelham, and Rick's Heritage had a decent selection in that price range.