They actualy released a 3700+ on s754? I thought they discontinued high end chips on that platform.
The benefits of the dual channel memory controller are already taken into account with the ratings. However, I'd go for the 3500+ anyway as s939 is a better potential upgrade path: the FX and X2 chips are gonna be on s939.
After seeing that, I would have to say go with the venice. I own a winchester myself, and it is one hell of a processor for only running at 1.8, but it is not stable enough to be oc'ed above that no matter what I do.