Everybody's Favorite - Minivans!

Hello!

I'm looking at different full size AWD minivans (full size mini if that makes sense).  

I have a minivan currently that I will be upgrading.  My budget is $8k or less.  The minivan is used to tow a small boat and a small trailer.  It is also used for hauling 4'x8' sheets of plywood or 8' studs.  Of the four cars we have, the minivan has the most ground clearance so we typically drive it if the snow is deep.  Because we often drive in moderately deep snow, I'd like an AWD system that had a viscous middle differential rather than an open middle differential.  

Which (if any) of the following AWD vans use viscous middle differentials (or equivalent) rather than open differentials?

Option 1:
Chrysler Town & Country
Dodge Grand Caravan
Pro - easy to get with 3.8L
Con - older 3.8L don't have much power

Option 2:
Chevrolet Astro
GMC Safari
Pro - high towing capacity 4.3L, super cheap
Con - ugly & truck ride

Option 3:
Buick Terraza
Chevrolet Uplander
Pontiac Montana SV6
Saturn Relay
Pro - 3.5L ok engine
Con - didn't start making them until 2005

Option 4:
Chevrolet Venture
Oldsmobile Silhouette
Pontiac Montana
Pro - Cheap
Con - 3.4L is weak

Option 5:
Toyota Sienna
Pro - best in class
Con - good luck finding one under $8k  

If you're planning on towing, I'd go with the Astro/Safari. They're pretty beefy, and share a lot of parts with the half-ton trucks. I've also seen guys swap V8s in them pretty easily, if you're so inclined.  

I agree with Ed. The Astro is strong and very inexpensive. The ride isn't THAT bad.  
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