I have a Viking Sapphire that I bought new for $1100 but it is not for use on a frame. It has lots of great features and should be alot cheaper used. It has a 10 inch throat.
I also have the Baby Lock Jane set up on a long arm table.
The table is an Imperial and with the Jane it cost $1500 at my local shop brand new. Jane is a strait stitch and is the same machine as the Brother 1500. I added a stitch regulator to it for another $500. With tax and delivery and set up it cost me $2300.
I can only do a 4 inch design per row because of the 9 inch throat.