Thanks KalamaQuilts for the extra info.
For those interested, here's a side-by-side comparison of the new 8900 and 8200 from the Janome site.
http://www.janomespecials.com/mc8900-mc8200/compare.htm
and another side-by-side for the older 6500, 6600 and 7700
http://janome.ca/machines/Horizon/compare1.php
Now hopefully I can do an apples to apples comparison!