Recommendations for a "mid-fi" digital coax cable?

I am looking for a recommendation for a digital coax cable that costs no more than about $150 to connect a Wadia iTransport to a North Star M192 DAC. Does anyone have any good suggestions? I am looking for something that is musical, detailed, but (most importantly) non-fatiguing.

Also, is there any truth to the idea that a longer digital cable (1.5m) sounds better than a shorter length digital cable?

Thanks