If it is a Sweet Sixteen, then it is the same model as I have except my Tiara 1 is branded Babylock.
I purchased it used with a few less stitches (not that it matters...that is a low stitch count.) for $2500.00. I got the bobbin winder, table, overlay and she threw in a bunch of rulers and the Tru Stitch regulator. She would have given me a bunch of fabric too, as she was relocating to an assisted living place...but I didn't think I could get it over the border.
Do you have any of these accessories with it? That would make a difference in the price, but I would agree that 2500 - 3000 is in the ball park.
Also, I bought mine off of Craig's List, if that helps as to where to advertise it.
Watson