I have 2 Janome's and LOVE them. I wouldn't own any other machine brand. Last year I won a Bernina and it's a nice machine, but it's not a Janome. I have the 9000 and a 10000, and believe me, when I can do it - I will head to my local Janome dealer and buy another one.
I have friends who have Bernina's and Viking's. I have heard too many times the grumbling of the Viking owners. Bernina's are a nice machine, but when you go to purchase new feet - take your banker with. I can't believe how much the feet are for those machines.
You will hear as many different opinions as there are different people on this board. The best thing you can do is take a few days, do a road trip to as many different dealers as you can and give them all a try. Remember to check on the prices of accessories. That may be a factor also, and one that is hardly ever mentioned.
Have fun and don't rush your decision.