Well.. I got both an BPPC and a B1260 and I belive it's worth it...
IF you can get it relativly cheap, find that the current and uppcoming PPC software is realy the way to go, calculate in the fact that you can have a GFX card in the machine without Zorro/PCI expansion and valuate that, and are willing to face the chance that OS4 might not make it to the BPPC card.
If you can say that 3 or more of the above statements are fullfilled then by all means buy it, else wait. :-D