I too, am an avid Janome owner. I have two 6600's...just had to get one for the cabin...they are absolutely great! No problems with the accufeed, in fact you can see better than that bulky walking foot. Would not trade the thread cutter on any machine, great for continuous piecing. The Horizon does not have a separate motor for winding bobbins and if you do your own quilting, you wind alot of bobbins., with the 6600 you have that separate motor. At this stage I would not purchase the 6500, even though they are nice machines. You can find slightly used 6600's from trade ins on the Horizon. I was fortunate to find a three week old 6600 with full warranty (lady changed her mind) for $900. I also belong to the Janome6500/6600 yahoo group, which is a terrific support group. The Ladies are absolutely wonderful about sharing information and tips on these machines. I would suggest you join..even before you decide on your machine. Love those Janomes....just bought a 3160 for classes. For the features and money, I would get the 6600. Diana 6600/4900/9000/3160 PS: Let us know what you choose.