I don't have this machine, but check overstock.com after you have test driven them. They have great deals on new and refurbished machines (that come with 20 year warranties) and shipping is only $2.95.
On looking at this machine, my main concern would be the space of the throat.
You have a great plan, taking your quilt sandwiches to try them out on as well as the squares that gave you a problem on previous machines. You are certainly a serious shopper and well prepared.
Good luck and enjoy the search experience.