I bought a Janome 760 Platinum GEM several years ago when I retired that I take for classes and retreats and love it. It's only 12 lbs--has 60 stitches and is a real workhorse.
I believe that Janome has come out with a newer model that several of my friends use for all classes and retreats & they have had no problems.
My Viking dealer told me once that the larger electronic sewing machines are not made to be moved and carried alot.
Good luck on your decision.