Yeah, I'd recommend hanging out and watching the DV-52's, 3 just went recently in the $800 range (and a couple for more, somebody just paid $1,400 for a sunburst DV-52)
But I gotta tell ya, my '76 D-25M is a real tone monster :shock: and you can pick up one of these easily between 6-800 clams. I would recommend the bowed/laminated mahogany back with the spruce top, somewhere between a '75 and an '81, and the good news is, correct me if I'm wrong, they made more D-25's than any other acoustic, so there's lots of them out there, meaning some really cherry ones come up on ebay regularly. Actually, there is also the D-25C (cherry) only difference being a slightly redder finish than the D-25M's of those years.
I've played a lot of bluegrass on my D-25 and it hangs right in there with the banjos and mandolins