Another satisfied owner of a fabulous Juki TL2200QVP Mini here! I'm currently quilting a queen and have more than adequate throat space. The Juki is a straight stitch only piecing and quilting workhorse. I recently bought a gently used Janome 8900 for it's decorative/utility stitches and it has a larger throat space (11") but for some reason I prefer quilting on my Juki. This combo works well for me and cost less than $2,000 for both machines. I did test-drive the Janome 9400 and enjoyed some of the add'l features (over the 8900) but it wasn't worth the add'l cost to me.
I also second previous comments made about how nice it is to have one machine for quilting and another available if you're working on other projects simultaneously.
I'm sure you'll receive many different opinions - in the end, it's up to what works best for you within your budget
Good luck and let us know what you decide to do!
Christine