I can't help you with the Janome, but I was wondering if you were aware of the Sunshine 16? It's a sit down machine, like the Sweet 16, but with a much more affordable price. It's not as fancy either, just a modified industrial. Their website isn't very good either, http://www.sunshine16.com/Sitemap.html and click on the side menu to pull up the different options. Don't skip Page 8 either LOL!
I haven't tried one, personally. This is the one I am saving up for, though!