A frame setup is a relatively big purchase. You should really do more research before buying. I have heard of breaking thread issues with the Janome 1600 on a frame (the 1600 refers to the number of stitches per minute the machine can make) and other problems with it. It is really just a fast straight-stitch domestic sewing machine that was not really designed for use on a frame. Plus the throat space is very limited. I also do not think the Gracie frame is the strongest one on the market.
Maybe for $850 you would be happy just being able to quilt by moving the machine instead of the quilt. However, most quilters who start out with a short-arm machine setup like this find it so limiting they soon want to upgrade.