Cheap DAC

I picked up an Adcom GTP-600, and I'm moving on to step 2, finding a cheap DAC to connect my computer, and cable box. It needs to have USB and toslink inputs. The cable box does have RCA and coax digital outputs, but I've found using anything other than toslink introduces a nasty ground loop into the system. Does anyone have suggestions in the under $200 range?
PS Audio Stellar Gain Cell DAC/Preamp
Denon DVD 2910
Quad 12L Active Monitors
Marin Logan Dynamo 700W

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