Fred get an old B&W g3 if you want to play old PPC Mac games, should be $50 or so.
Of all the systems I own (old Mac, PC, and Amiga) I find that the Amiga is the most expensive to upgrade anything on. I have old 68K Accelerators and other cards that were rare and very expensive new that cost less then a new Amiga mouse now!
While I can see why an old Amiga user wants to have the best of the best he could never afford, I can't see why he is willing to dump so much cash to do it and get so little out of it. Ever time I hear what people spend to play a half assed quake on their PPC Amigas I think they need to get their heads checked.