The Blizzard wasn't the only player in the game. The GVP '030 cards of old were excellent... very well made, reliable, and compatible (heck, even my '060 GVP TekMagic works well with WHDLoad).
The downside was the proprietary RAM, also the MKIV Blizz had a better SCSI option.
However, I'm not sure what the GVP "Typhoon" is... hopefully a remake of the
A1230+. Might want to wait for some more info/pics before ordering.
The Microbotics '030 card is the only one I know of that might cause problems with WHDLoad, as it (apparently) generates some random exception that crashes games and demos. I have no first hand knowledge of this though... could be an inappropriately configured card (flashrom parameters could be modified) or some other user error.
Obviously, the MKIV Blizzard was a nice card, arguably the best... but there's no reason to shy away from some of the other great cards out there.