Tube DAC to take edge off Rega Planet 2000

I have been trying to buy a CAL Alpha, however, they are alway sold by the time I make an offer. So is there another Tube DAC within the CAL Alpha price range that is at least as good as the cal in sound and build quality to take the edge off my REGA PLANET 2000. I have a pair of Paradigm S2's on JPS Superconductors now and will be hooking up to Mac MA 2275 soon.