I looked at all three...6500, 6600 and Horizon and chose the 6600. It sews like a dream. It does not have the free arm feature but you don't need it for quilting and I have several other machines. If you can find a good used one from a reputable dealer it would be worth it. Love the accu-feed feature on mine. Take your time to decide and get the one best suited to your needs. BTW congratulations on your new machine whenever you get it.