Hi Julee,
I have the 6600P....which I really love. The difference between the 6500 and 6600 is the integral walking foot which I do use for quilting I have to say.
The only complaint I have about my machine is the paint work niggle it does mark easily.
I think the 6500 is really good with reviews I've seen but it would depend on price...Janome have just brought out some new machines so you should get a good price.....I would be tempted however to phone round and see if you ould get the 6600 cheap ...you wouldn't be disappointed, a real work horse.
Good luck...let me know what you decide.