Not exactly the same but worthwhile point for those who are also considering a new machine -
WHen I decided to upgrade, I careful considered what was important to me and I decided that harp size was a mission critical item if I wanted to do more FMQ. Then I made the financial decision that I would rather get a better used machine than make sacrifices to get something new. I was able to get my Janome MC6600 for $800 from the local repair/sales place because it had been traded in. Came 6 month warranty and a service call after 6 months. I've been really happy. No regrets.
Summary - decide what's important and what is sacrificial. The instant you walk out the door, it becomes used. A good shop will stand by it's products regardless of whether it's New In Box or Floor Model.
It's not a car. While it's had plenty of test drives - nobody really beats on a sewing machine the way they do a car. I would feel fine with the floor model, but that's me.