I have a Viking Sapphire 830, which I got about 6 months agot to replace my old Viking 400. I love it. It did take a little getting used to. I still reach for the presser foot lever! LOL Many people are very dedicated to a particular brand. I would also consider the dealer you purchase from. I passed on getting mine at the Viking inside of Joann's (the most convenient place) because they are generally rude to me. I purchased from another dealer who also offers free lessons for my machine anytime (not just 2 lessons like Joann's offers). She's been very helpful to me and does what she can to accommdate my schedule.
Try out a few and go with what feels comfortable!
Oh, and my old Viking I had for about 15 years and was never in the shop! That's a big reason I wanted another Viking.