I think that so far, the D2D-1 is a good value. It does not do all the software stuff that the P-1A aspires to, but I hear a noticable improvement with it. It's a dependable and predictable upgrade and very well constructed. However,it does not support RCA digital I/O without a BNC adapter - I am not sure how badly the adapter degrades the signal. Be sure to get the I2Se interface if pairing with a 3 series DAC. While TPC has a standard $100 off special when purchased with their DAC, they also have a moving sale going on this weekend, and they've been known to cut some generous deals on packages.