Better board for overclock dual opterons

[ColdBrew]

I pricing out possible buying a dual opteron system and wondered which board you all think would more likely have more overclocking options.

Tyan Tiger K8W (S2875) - I don't think this board has actually shipped yet, as no one has one in stock. Overall I think I like this one the most with features/pricing/name.
Tyan Thunder K8W (S2885)
MSI K8T Master2 FAR

TIA