The front suspension on a VR/VS is easier to work with from past experience. My current VR wagon doesn't have the split fold seats and is a series 2!
You can find a decent VR/VS wagon on ebay for around $2500 without any issues.
i would go the VR over all them. i am not a fan at all of the VP look and i like the buicks in the vn to vr than the ecotecs. better feel to drive i reckon.