I think I'll be going for one of the Intel Core 2 Duo processors and the Nvidia 7900GTX GPU, and selecting a motherboard around those. Nearer the time I'll drag-up this thread for advice on cooling, cases and boards
Its a shame that Shuttle don't make some slightly larger cases that will take 1x PCI-E (GPU) and 2 regular PCI cards (TV card and sound card)