Almost as important as the machine itself is the service AFTER THE SALE from the dealer. Do they offer owner's classes at no cost? Do they, periodically, offer creative classes so you can "get hte most" out of your machine? Are they available when YOU need them, either in person or on the phone?
You can get the machine with all of the features you want/need - but if your dealer is not there to help after the sale has been completed, you will not get the most for your money.
In my area, the Viking dealer is absolutely the BEST, and I have 4 different Viking machines, including my serger, as in addition to quilting, I do home dec, machine embroidery, and garment sewing.
Take your time, TEST DRIVE everything, and good luck with your search!