It is quite important to get the right one - as mentioned earlier, multiple keypresses on the Amiga are pretty much essential. I couldn't imagine not being able to CTRL-C to escape etc.
Mine is the one which came with Power Computings's Power Tower (it could be the PC-key 1200, but no reference to a name is in the manual, it is always referred to as "the universal keyboard adaptor" or "the keyboard interface"). It does support multiple presses.
Cheers
