The Brother 1500 and Juki 2010 both have a 9" harp. But because they are not zigzag machines, they have a small housing above the needle, so you can get much more of your quilt sandwich in there. I have a Janome 8900 and really like it. It has an 11" harp, but since the housing above the needle is so large, I find I can FMQ quilt a larger quilt more easily on the Brother. Actually the Brother does a better job of FMQing than the Janome. And at a fourth of the price.
If I were replacing machines, I'd go with the Brother 1500 or Juki 2010 and buy a cheap computerized from Walmart for decorative stitches. I have a Brother CS6000i that I really like. It's a 3/4 size machine, so is small enough to be easily portable but has enough stitches to do just about any decorative I want.