Hi! I don't know this, but if you buy a Blizzard you should not have compatibility problem.
I don't recommend you to expand now your 1200, AmigaONE is coming :-)
I have a super 1200:
Blizzard 1260 060 50Mhz MMU FPU 64Mb Ram
Mediator+Voodoo3+SoundBlaster128+Ethernet for fast internet and network, Tv Card (WOWWWW)
2 hd 8+20Gb with Elbox 2-ide
Elbox (Power tower) 1200
Punchieniello (mroocheck) with a logithech mouse 3 buttons and scrool.
A cool LCD monitor :-D
A good audio with subwoofer
YEAH 8-)