I agree.
The only thing my SB128 is really good for is convenient audio input and mixing with the CD audio. If you plan on using higher bitrate audio on SB, you'll need a 68060.
Streamer2 supports the parallel-port MAS and MAS Pro as well as the Delfina, so you could even listen to Internet Radio on a modest machine. (Well, one that supports OS 3.5)