Emax

hi all,
I just bought an Emax SE HD (Rack Version). I intend to replace the HD drive (which is broken anyway) with an external SCSI drive. Now I am a bit confused about the different kinds of upgrades for different Emax versions.

Is a SCSI iOmega Zip drive still the way to go? Are there better alternatives?

Do I actually have to buy one of those SCSI upgrade kits or can I get the parts I need from my local electronics shop? I understand it is only a matter of extending the SCSI cable that is already there to the back of the Emax. I am located in Switzerland so I don't really want to order anything from the US because of the shipping cost. 

Do I need the Plus software disk? I read the instructions that someone posted here and they don't mention the Plus disk except in the contents of the SCSI kit. If I need it, where can I get it without buying a whole kit?

Thanks!