Just an FYI, the 4400+ is $557 on ZipZoomFly.. best I've seen this in awhile. Just yesterday it was $605 on ZZF, and before that it was $580. So, we're seeing a very sporadic price trend, and hopefully it will just go lower...
http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=80726-R
http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=80726-R