Combine Motu 24I/O and internal spdif with "aggregate device"

Hi,
i'm using locic pro 7 with a motu 24 i/o for recording e.g. vocals. To improve the quality i plan to buy "benchmark adc-1 converter, but there are no digital inputs on my motu. Can i combine the 24i/o with the internal spdif input? The motu runs at 64 samples without troubles. if i combine both via "aggregate device",what about latencies? is the latency of the motu as high as the internal spdif? Should i better buy a digital card (rme)? Does anyone know a good digital card (pcin and not too expensive)? Thanx a lot,
Oliver

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