I own a Oppo BDP83 and a Monarchy DIP classic. However, I use the Oppo for video/surround only. I run the Monarchy between a Wadia 170i and outboard DAC. Although this doesn't necessarily answer your question, what I have found with the Monarchy is a definite improvement. If it will improve your "signal chain" in your configuration, I cannot say.
Is the Monarchy DIP effective?
Considering buying a Monarchy DIP between a Sony 7700 dvd and a CAL Sigma 24/96 dac. Would I benefit using one and how much of a difference can I expect?