Nice detailed comparison.
I personally did not hear one bit of difference when I compared the DPS with the Elpac when I had the GL. I must of spent a couple hours straight switching between the two, using the same amp, until I drove myself nuts.
I bought the DPS based on someone saying that it resulted in a "MASSIVE" (his description) increase in bass response and clarity. It goes to show how highly subjective this hobby is.
In retrospect, I would of kept the DPS anyways because it looks cool when the GL is stacked on top of it. I returned it (and sold the GL) because I went with a GS-1.