I totally agree about the Quadra 630. That is still my favorite Mac to this day. It was also the best early CD recording platform too. Well at least in 1993-1994 when I got mine. Early Astarte Toast ran extremely well on it since the Pinnacle CDR (2x) wasn't being hindered on the scsi buss. Never a buffer underrun on that machine.
Now the 6360 was also a nice machine and in fact I have another Q630 sitting in the basement that got upgraded to the 6360 with the case plastics upgraded too so everything matched up.. It has OS 8.6 on it and some version of YDL too.