FWIW, I believe ADSR is in Europe so MacMall, etc. may not be all that convenient.
I have an Initio,MilesU2W SCSI card in my DA which is connected to a 36G drive and it works fine. But I did have to do some updating of the firmware while in OS 9 to make it work. The SCSI card that came with the DA (on some models) was an Ultra card but some people added legacy cards (like in mine) and it wouldn't recognize an external SCSI drive I have while my Wallstreet saw it fine (in X).
Remember SCSI drives also have to have ID numbers different from all other SCSI items and must be terminated at the end of the chain.
There is a good reason why they talked about "SCSI voodoo".