I have a vintage singer and two vikings , amougst the family we have about 8 Vikings. My Mom just bought Viking Ruby. we are all hard users.. from drapes to quilts. We all really like our Vikings.
A a general rule look at the dealer, compare warrenties, and test drive. Make a list prior to shopping of you must haves, and nice to haves, that you want on your machine... and the price range that you feel comfortable. It can get very confusing and easy for them to "up" sell you once you are at the dealer.