In my quest for overkill - well actually just 192 khz sampling, I came across this bugger:
The Roland Edirol FA-66
$259 to $280
The FA-66 is a 6-channel Portable FireWire Audio Interface designed with the mobile recording and performance professional in mind. The FA-66 offers incredible audio fidelity, stability, and a practical set of input and output options. The FA-66 offer 2 XLR/TRS combo inputs with phantom power and 2 RCA inputs, 4 Balanced +4dBu outputs, optical S/PDIF I/O, a built-in analog limiter, ZERO-latency direct monitoring, solid metal construction, and FireWire bus power, all with a durable compact design.
While the 24 bits is completely overkill, the 192 kHz sure would be nice for color modulation. It's firewire and ASIO, which are both good things as far as I can tell.
