I don't think you'd be happy with a 6600 on a frame. It's not going to give you much room. Personally I wouldn't put the 820 on a frame either. I get ahead of the 830 all the time, using the BSR. They're FAST machines, but not as fast as a long arm. You would be irritated with a $2,000 frame. I have the 830 but will want a longarm in the future too.