Hi CSB
I love Janome machines. I have the 6600 and purchased the 3160 as a lightweight "travel" machine. I have had no problems with it and have had it for 5 years. I traded a Gold Jem in for it. It weighs about 12 lbs and sews beautifully. The advantage to staying with the same brand is that the learning curve is very very small and the feet are interchangeable. The 6600 is a 7mm machine and so is the 3160 so I can use the same feet on both. Don't know if the 6700 is a 7 or 9mm or whether that would factor in for you. But I don't think you can go wrong with a Janome.....just saying.