Congratulations, you'll be very happy. I love my 7700. You'll need to get used to putting on the Accufeed feet. Clumsy at first, but it will become second nature in no time. Make sure to get the 1/4" foot and the ditchquilting foot too. They will come in handy, although not cheap.
Also, make sure to register your product on Janomewarranty.com so you will get the new upgraded regular 1/4" foot that works better with the feeddogs on this machine. It is free and will be mailed to you within a couple of months.