why do you want nforce? only until late spring did the chip not have problems going as quick as via. now, it seems that with an nvidia video board, like a new one, it goes even faster on the MSI ones. The VIA k8t type chipset has been running at 1000mhz hypertransport without a bottleneck since its debut over a year ago. (something nvidia didnt crack after 3 tries till now).
I personally would go VIA chipset and MSI. The via on the msi have the ability to utilize ALL the possibilities that amd offers, including cool and quiet, which slows/cools things down when idle for a while.
Chaintech is a classic "i like that on here" so thats a cheap and decent option too.
Abit is as well.