Doctorb,
Thanks for your post. The upgrade sounds as though it is a significant improvement in your system. I listened to an upgraded C-5 at my dealer's store and was impressed with the lowering of the noise floor and improved musicality. Mine's shipping to Ayre next week for the upgrade.
The C-5 is a fraction of the cost of my analog rig and while it's not as good (analog's richer and more dynamic), it's very good for the price.