I have a Babylock Crown Jewel also and love it. It came with a Grace Majestic frame. Babylock offers a 4 day class in St. Louis which I attended and came away with lots more confidence. I tried every longarm at the show at least twice and loved the Jewel the best. I was able to get interest free financing for 4 years at the show as well.
I have purchased design boards from HQ for the Avante, which, as Kacy said is the same machine. My only problem is that the nearest dealer is 1 1/2 hours away.
I bought my Jewel at the Cincinnati Quilt show in the Spring and got a great deal there compared to what I have seen elsewhere. The class was included in the price but I still had to get to St. Louis and pay for a hotel room, but the Baby Lock folks helped me find a roommate so the cost was alot less. The class is taught by Kay Capps Cross who is an excellent and very fun teacher.
I agree that the location of a good dealer for your machine is an important issue so check out what is in your area and then look at those machines. But try them all, shake the frames, ask questions and stand around and listen to what others say - some will be folks who have that machine and can give you good info.
Good luck!