I have the 8200 and also a 875Q Viking (which I think is very similar to the 930)
I've always had Vikings and then I thought I'd try a Janome. They are totally different machines 1. Viking is wonderful, great for appliqué because of the automatic presser foot lift and the auto tension and pressure work flawlessly. You won't even notice the difference. 2. Janome isn't as good over thick seams and is a very picky machine in regards to thread. It sews much faster and does a good job.
I think you will be happy with either machine. I feel more "at home" with the Viking because I've sewn on a Designer 1 for 15 years and the Janome was so different it took some time. I love both but when the Janome likes the thread and settings it's wonderful but it is picky. Let us know which one you choose.