I bought a 7700 last summer, primarily for the larger throat space too do FMQ ... and the extra lighting! Both are great. I love it ... however .... I have to report I have had some problems with mine. The main circuit board went out and had to be replaced. A couple months later, the motor that runs the thread cutter mechanism when bad. I'm still waiting for that part to arrive ... I'm assuming the delay is due to the earthquake. But, I can still use it ... doing a bed quilt for my grandson now.
It was suggested on the Janome user group (in Yahoo), that some of the units with serial numbers starting with 1 had some initial quality problems, and guess what, my serial number start with 1! I think units coming out now are probably more stable.