The 03D has the same A to D convertors as the 02R, which is what I use. The Ramsa does have nicer convertors, but I chose to stay with my 02R because of the flexibility of routing, internal effects, etc.
If you want to upgrade your 03D, get the Apogee AP8 AD cards, which give you 8 higher quality A to D's.
Apogee is currently blowing these out.
Scroll down about halfway.