I just bought a Janome 7700 and a Janome 3160 as my class machine. I haven't used the 3160 other than in the store.
Re: the 7700, I'm waiting for my O2 foot after which I think I'll be more satisfied with the stitching over multiple layers when piecing.
I looked at the new Vikings but they felt flimsy. The Janome 7700 felt so much more substantial and was one reason why I purchased it.
I am - though - feeling a little sad about my Viking 1+ which I plan to sell and I think that sadness is somewhat hindering my ability to love my Janome. :(