Weiss DAC202 vs ARC DSPre without preamp

Weiss DAC202 or new Audio Research DSPre.
I want to buy one of these DACs without preamplifier (directly to the power amplifier monos) and connect to PC via USB/FW.
Any thinks about this match. Which one is better?

Thanks in advance for opinions!
Weiss DAC202 is a fantastic as the DAC and as preamp: sound is big, transparent, driving.
But I don't collate it with ARC DSPre or DAC8 in one setup...