Juki is relatively new to the longarm field. Personally, I would avoid it. I don't know about now, but a couple of years ago there were complaints that the presser foot interfered with ruler work. There were some reviews on Amazon also that were not very flattering. Do a search on the QB here also; I know there were some threads that mentioned the Juki.
Can you go to a quilt show to try out a variety of setups?
Depending on your budget, I would recommend that you look closely at Innova longarms. They get the best reviews, both for use and support. If you go to groups.yahoo.com you can join the two Innova groups there for additional insight. If a new setup is outside your budget, see about getting a used one. Dealers sometimes get them as trade-ins. Also, there are a couple of online websites where you can look for used longarm setups.