I have a used Gammill Classic Plus. It was my 2nd upgrade coming from a Juki on a table top frame, then upgraded to an HQ16 and then the Gammill. I found it on www.houseofhanson.com Look under 'formerly owned machines' on the right hand side. I suggest going to a quilt show and trying as many as you can get your hands one. One will feel like a good fit with the right price. There IS a learning curve so be patient.
Good Luck!
Beth in AZ