The problem is this though...
You get an A2000... then you put a PCI board in it, on that PCI board you have a Local Bus for a CPU upgrade.
Then you Put a PCI gfx card in it, a new CPU card with 256 Megs of RAM on it, a PCI sound card, a PCI network Card, a PCI IDE card (with a DVD-R/RW and a 120Gig Hd), a PCI USB card with a new Keyboard and a new optical mouse.
Then you have to put a new Power supply in it to handle all this stuff... What are you left with?
A new computer (since the A2K motherboard isn't used for anything) in an Amiga 2000 case...
Keep the A2K as a working museum peice and get a new computer :-)