With only a $400 difference, I understand why you're tempted! That being said, I would really want to give the 7700 a thorough workout to make sure there aren't any issues with it. I've been tempted to trade up my 6600 a few times but the difference was usually $2000 and at the time, I had heard too many negatives things about the 7700 (mostly how sensitive it was ). The larger throat is really appealing though. While you're looking at the 7700, check out the new 8900 if you can afford it. Good luck making your decision!