Untill we don't have New gen Amiga (with current PC futures) for price of 400-800 PPc card will be good choice
PPC for Classics was a false economy when Eyetech was formulating the AmigaOne back in 2002 that is why they went with a stand-alone machine. Things haven't changed today. If you have an old Blizzard/CyberstormPPC board then you get to try AmigaOS4.1 and then hopefully you'll see the need to upgrade to the faster and more stable version on next-gen hardware. It is simply not worth anyone's while getting a PPC board for Classics in order to run OS4.1 as an alternative to next-gen hardware. Get a Sam or the X1000 instead.
The fact I've never heard of this Ultimate PPC board pipe-dream means that it is no doubt another ACK Solutions/Troika/Boxer system that is not worth our discussion time because until it's on sale it doesn't exist!
_________________ "Art challenges technology. Technology inspires the art." John Lasseter, Co-Founder of Pixar Animation Studios