IMHO don't bother with a accelerator card for the A500. Leave it as is. Get the 1MB Chip if you can, and some fast RAM. Even a HD like the A590 or other type would be good. Or if you can get the AdIDE and Novia kit! I have a
A500 with 3.1 ROM, AdIDE w/120MB internal HD and Baseboard 4MB. Nice little setup.