Thanks for the reply!
I tried the boot menu (I had no idea this thing existed, my previous amiga was a 1000 and afaik it doesn't have this menu).
A few games work better with the settings you said. But most games that had problems before, still don't work. I noticed that at least one (I'll have to experiment more) work when I physically unplug the Blizzard card.
Could this be a faulty accelerator? Or it's an incompatibility due to the extra RAM or different CPU?
So is there no way to disable the card via software?
For file transfers, I already ordered the PCMCIA thing, but it's still to be delivered... so for now I have to do with what I have! 
I've also ordered the IDE-CF adaptor because the IDE cable coming out of the back of the Amiga is really ugly.
Sounds like you're on the right track.
Give up on floppy disks (waste of time), just install your CF card and then go and download WHDLOAD. This is by far the best way to play all of the old games (without the compatibility issues).
As for your mouse problems, I found a nice way to get a decent wireless mouse working on the A1200.
