I would probably go with an Intel right now, but that's because the two chips are roughly equal. IMX, the quality of Intel chips is somewhat better (never had an Intel chip fail) and I also find that Intel CPUs with Intel chipsets make the most stable systems. IMX, Intel runs cooler, too.
I don't like VIA chipsets (they tend to be buggy, IMX) and haven't really been impressed by some of the driver problems I've seen on the nVidia chipsets.
I have no interest in jumping into 64-bit right now either, since I have no OS and no application that supports it, let alone that significantly benefits from it. By the time 64-bit becomes worthwhile, DDR2, PCI Express, SATA, and (possibly) BTX will be pushing the marketplace. That means I'd end up running 64-bit programs on hardware that's wholly out-of-date. No thanks.