Asus K8N-E no question.
the K8V SE Deluxe is not the latest via chipset just FYI, it's the first one for A64's, and has no AGP/PCI lock, which is not good for OCing. the K8T800 PRO chipset has the AGP/PCI lock. The K8N-E will also probably be faster at default speeds, but not by much.
The K8N is a great board. I have used several. I would recommend it to anyone.