Bill,
I have decided to have a go at Kontakt2: it looks like the most powerful program of the lot and can read almost all the known formats. The only limit is that apparently cannot read floppy disks and I have quite a bunch of them from the Akai and Ensoniq days... I have also a few Syquest HDs connected to my samplers through a SCSI port and wonder if they would work with my PC.

Diki,
I don't know if Kontakt2 or Halion can read the programs as well, but having to reprogram everything from scratch doesn't worry me much. After having programmed tons of patches with my Ensoniq ASR10 (a real nightmare when it comes to user interfaces ... ) working with a soft sampler (and a BIG LCD display) looks like a dream...