inexpensive ADC / DAC for SM57 --> Symetrix 302 --> PC ?

Greetings -

Just picked up a Symetrix 302 for a cost-effective pre into which to plug my SM57 & AT2020.
Would welcome suggestions for a suitable ADC / DAC to feed Audacity / Reaper.
I'm thinking along the lines of the AudioFire2 but, notwithstanding a fair bit of forum surfing,
know next to nothing 'bout suitable recording chains and would welcome experienced insight.

Thanks kindly.

- Richard
richard AT oldWithoutMoney DOT com
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