I had a Juki TL98Q and really liked it. I sold it so I could buy the Janome 6600 since it has a lot more features. I had to search and finally found the Juki long arm you're talking about. It really looks like an awesome machine. I don't think I've ever seen a take up bar on any other frame but it would definitely be a nice feature.
For anybody else that wants to take a look at it, I found it here.
http://www.kenssewingcenter.com/juki...e-p-30982.html
I'm thinking about at some point in the future converting half of my garage to a long arm space and this machine is now at the top of the list!