I had a Cyberstorm MK-II with an 060, but it seems most of these boards will not work properly in an A3000 due to some SCSI / DMA issue.
You had the bad buggy CSMKII card. I have the same card and it worked flawlessly in my A3000, which until recently I removed it and installed it in my A3000T! No INT2 mod needed too since this card does not have built in SCSI.
As far as which one if you had to choose? I would get the A4000, since it will be able to run ALL Amiga software, and it has AGA, which is cool. :banana: