I was a CSPPC owner for a long time up to just a few weeks ago. I want to warn you that at present there just isnt that much stuff out there that supports the PPC on classic Amiga computers. I just about never used the PPC for more then mp3 or a few games. Its a wast getting one, and I had an 060 on mine. I would get the 060 card for sure. It will give you a lot more speed boost. The 040@25 is a slow CPU and you will be real upset over it.
Now I am using a Pegasos II system. This makes classic apps run real fast! Much faster then my A3000 with PPC ever did. It wont run anything that needs the custom hardware, but the few things I need that do I cn use UAE to run them just fine. Just about all the more modern apps will run perfectly. Thats another option you may want to look into. You can get a G3 Pegasos II for just over $300 USD. Thats about the going price for a classic PPC card.