I've owned both the Benchmark and the PS Audio, as well as a Musical Fidelity V-DAC, haven't heard the CAL.
To me, the Benchmark was too bright/harsh. The PS Audio was very nice, smooth yet detailed. But I ended up keeping the V-DAC. For about a third of the price of the PS Audio, it was very, very close. I'm still not sure if I heard a difference or if I thought the PS Audio was better because it looked nicer and cost more.
Good Luck
To me, the Benchmark was too bright/harsh. The PS Audio was very nice, smooth yet detailed. But I ended up keeping the V-DAC. For about a third of the price of the PS Audio, it was very, very close. I'm still not sure if I heard a difference or if I thought the PS Audio was better because it looked nicer and cost more.
Good Luck