ADSP21xx, if they are still available. Used to be $5 each for an ADSP2105, though I preferred the 2111, instead. The ADSP21xx I used (not the fastest) had an 80 ns cycle time and could read from two sources of data and perform an ALU operation in each cycle. Nothing interfered with the cycle counts, either. Zero-cycle overhead DO loops. And no weird wait states, etc. The ADC I was using at the time was close to your speed. And I was wasting cycles (NOP) to read it. Wouldn't handle 15 such ADCs by itself. But with bursts, sure, if you have a FIFO to work with.
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