Prizes are lower on this page :
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPC8610&tab=Buy_Parametric_Tab

(it's for 1000)

- Dual core CPU is useless in AmigaOS/MorphOS. So no 8640D.
- You can do several variants : low cost with 8610/800 MHz, up to 8610/1333 MHz.