If you want to do border quilting, ask the Viking dealer to show you the Endless Hoop. You leave the hoop on the machine and advance the fabric, giving you a continuous design.
I have purchased used machines from dealers in the past. Usually an excellent price, warranty and lessons, so the demo machine may be for you.
Also a good dealer, no matter what brand, is worth their weight in gold, so maybe which ever dealer you have the best rapport with.