BTW - just to close this out, based on everyone's kind advice I went
with a Transwarp. The system took a bit of tuning in but everything
works great now, including Ramfast DMA. With the Uthernet and
Marinetti, it runs Spectrum / SIS like a champ.
Here's the configuration in case anyone's interested:
slot 1 - 384 Focus
slot 2 - Prograppler
slot 3 - Transwarp (stock 7, pending release of Henry's new upgrade)
slot 4 - Uthernet
slot 5 - VOC
slot 6 - Ramfast rev D (spare HD, Syquest, CD rom)
slot 7 - empty
mem slot - Ramkeeper, GS Ultra with 2 meg - front, CV tech 4 meg -
rear
All powered by a PC power supply connected to a Littlepower.