LennyZ - the 815 chip will ALWAYS give better memory scores -- unless you know about the Hex-tweak utility for the VIA chips. You sort of have to get your hands really dirty, but with some effort and time, you can get the VIA to perform similarly. But, I find the VIA drivers not-so-good (and 815 has native support under ME), and the lack of working AGP4X is annoying (since you're still "paying" for it).
I also really think the ICH2 hub which the IDE ports plug into on the 815 chipsets kicks the VIA solution which has the disks plugged directly into the PCI bus (poor design reminiscent of the past). This frees up PCI bandwidth for your PCI cards and USB ports (and, the USB doesn't entirely go through the PCI bus on the 815 either! (only the extra ports beyond the stock 2 ports do))