Hello angelomilone1976 i used a Vampire in my A2000 once, all my other cards stopped working. The autoconfig was missing in the Vampire so compatibility was zero in my case. However could be that those things have been fixed with the 1200 model. So you just have to by it and try it, i guess.
The 1260Blizzard works like a charm on my ACA500Plus, but then again Phase5/DCE were the fastest cards around those days. Anyway i am waiting on the ACA2000, then that 1260 will get a decent fit for once :-D.