I am getting ready to purchase either the 8200 or the 8900. I've looked at Janome's charts and I'm having a hard time determining just what I will get for the approx.$500 price difference. I know about the extension table (around $150 on line), the larger foot control ($89 from Janome) and the extra stitches. I've never uses all the stitches on my 6500 and the serpentine stitch I really want is on both machines. I'm having a hard time finding a dealer who has both machines in stock so that I can really compare them. What makes the 8900 the one to purchase?