I also own a Tascam US-366. It is $146, but right now there is a $50 rebate which makes it $96.
It is asynchronous USB with up to 192 kHz/24 bit playback. It also includes optical and coax SPDIF input, optical and coax SPDIF output, AES/EBU output, headphone preamp/output, microphone preamp with 48v phantom power, and digital volume control. It has both balanced and unbalanced output with these available as 4 separate channels.