@ Cyberus
Personally, I still stand behind the GVP A530. Hard drive, SCSI, RAM, 030, and a disable switch (plus a separate kichswitcher) for 1.3 fallback. Only downside is that it maxes out at 8Mb. Can the Viper do more?
@ fatman2021
ISA expansion? You can get Zorro and ISA expansion for the A500, but you'll need a bridgeboard and such items are extremely rare now. To the best of my knowledge, A500 PCI expansion does not exist. If you're into hardware design, you could probably build a video slot for the 500, plug in a Picasso IV, and then try to expand the mini-PCI bus on that, but I don't even know if the correct signals are available for full compatibility. You're better off finding a 2000 and bridgeboard, or a 4000 and Mediator.