Recommendations - DAC $500 w/ USB

Has anyone had any experience w/ the Musical Fidelity V-DAC? ...especially compared to the Cambridge Audio DACMagic? These seem to be two of the obvious choices for those of us who can't/won't drop big money on a DAC and who want a USB input to use with a computer.

Are there any other DACs that should be considered?

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Consider the Taiwanese units - Valab at $200 shipped, Keces at $275 and various Paradisea units from $350 on up

All offer unbeatable price performance ratios