I would suggest to hold out for the Vampire V2 A500 unit, as this is very likely to be compatible with the A1000 / A2000 range of computers.
With 128MB of FAST RAM, Onboard RTG graphics card, HDMI out and MicroSD mass storage - this is quite an amazing card with its current Silver 2 Core pumping out over 85MIPS (or Apollo 060@66Mhz aproximate) - and its likely to be much cheaper than the ACA12xxx cards.