The 6600 should be under the $2000 mark ... not sure about the 7700.
You might want to check out the newer model, replacing those .... I think 8200 or 8900?
There's some good improvements in these newer models.
I had a 6600 ... and still love it, even though I have upgraded since.
It was my first deluxe machine, and got me so hooked, that before long, I went for an upgrade, which when buying it, I never thought I would happen. All because it was so good!