The 830 with the embroidery module is quite heavy to be lifting on and off your quilt frame. It does a wonderful job quilting and you can add Quilt Motion to it if you want to do computerized quilting. But it's quite expensive.
I suggest you check out several machines before you buy. You may be able to find a gently used/reconditioned long arm and pick up an embroidery machine for the price of the 830. If you can test "drive" the machines, then do so. Go to a quilt show, if there will be one in your area and talk to vendors and try their machines and compare prices.
I love my Bernina 440 but I would not buy an 830 just to put on my quilting frame. I'd opt for a long arm.