The Dodge Grand Caravan I rented last year for a trip to Colorado is probably the nicest vehicle I've ever driven/ridden in. That may speak more to my experience riding in fancy cars, but it was really nice all around.
Leathered out, all the amenities, tons of space, a lot of power and pretty tight handling. It felt great driving it. You forget you're in a minivan.
You can get one bossed out for a hair under $40k.