I like the Husqvarna/Viking machines also, and I have an old Singer that still works great.
I have also spent a lot of time around commercial double-needle machines- they sew two parallell rows of stitching at the same time, I have used Juki and Brother double-needle machines. You don't want to get your finger caught in those- they have a motor the size of a coffee can. For home use, make sure it can do a blind hem and variable zig-zag.