I'd say forget it, those things are much more expensive than Blizzard 1200/4.
you can emulate ppc now with UAE.
IF you want to emulate an A1200 with a PPC card on your PC, which always seemed like a weird way to downgrade your hardware to me.
I'd buy the X5000 too. I would greatly outperform the real or emulated PPC equipped A1200 in NG apps.
Otherwise...stick with Windows, MacOS, Linux.