Still chasing the problem. The drives are all fixed, that seemed to take care of the "overall slowness", but there are still spans of time things seem to bog down. I was reading and posting at about 8 PM CST, server was very slow, but not aweful..reading and posting now (10PM)... things are much faster. One thing I noted at about eight we had over 100 users loggged in, now about 35.... that really should not make a difference, but that is all I see from the outside. I'll have the ISP look at the logs from this time frame tomorrow to see what they notice. Previously, the logs showed extremely heavy CPU loading when things slowed down. After the drives were replaced, the CPU usage went back to normal.
Now it seems to be primarily the programs using the SQL database (forums, galleries, and to a lesser extent the marketplace). When the drive had died, all areas of the site were slow... this is no longer the case.
Thanks for your patience.