Digital Networks UK have replaced my shiny new PC, with an even more shiny version. The new systems use a newer nForce motherboards, PCIe system bus, and the latest AMD Athlon 64 and Athlon 64 X2 dual-core processors.
The only consolation is that the new models are more expensive when spec'ed out at the same level, though it's possible to get a much faster model than was possible when I bought mine a few weeks ago - if you like spending silly money.