Not a good price at all. I only paid around $2K in 2010 when the 7700 came out. I priced every dealer in the surrounding areas and I had a good machine, but I traded it for a Pfaff because I missed real IDT. Those Accufeed feet were so clunky. The regular snap-on feet were wobbly in my opinion.
I would go for the 8900 with the improved Accufeed feet, but that is too much money. Let me just say one of the other things I didn't like about the 7700 was there was not a lot of piercing power. I eventually bought a straight stitch Brother when I wanted to sew heavier things like bags. Oh and I also think the throat plate was improved on the 8900.
Look up used prices for both 7700 and 8900's. These come up for sale often. Prices for gently used 7700 are around $1100 right now online. So figure if you bought it, it would be like driving a car off the lot right now and not being able to get that much for it, if you decide you don't like it.