I had a similar situation earlier this year. Although I have always been a loyal Janome fan, I feel like they have fallen way behind in the embroidery field so chose the Babylock Ellisimo. I have a friend who has a Viking Diamond and it is a lot more difficult to operate and is very sensitive to having lint cause it to lock up. They have replaced the sensor twice. Another friend has the Bernina monster 830 and since she has had a terrible learning curve (I consider her quite intelligent) and it cost more than I could justify spending.
I have heard that Janome may be coming out with a new embroidery machine next year to compete with the larger hoops and other features.
Whatever you decide, it is so important to go spend some time playing with the machines.
Good luck and happy sewing!