600 Euros? Maybe its for someone who's really into OS4 (and has some money to blow). Aros? Nope the X86 port's the one they're focusing on. MorphOS? A Mac Mini (or, when an update is released, a Powermac) would be a better solution.
X4 PCIe in a X16 slot=crippled video performance. One X1 slot, 1 SATA connector, and a price that would buy you a fairly nice PC (for a motherboard only).
I'm glad you guys are optimistic. I'll wait for Powermac support on MorphOS.