Grand Cherokee is a great truck, IMO. Specifically the Summit trim, drove one a few weeks ago, an ecodiesel. If we were looking at this price range, it'd be tough to beat.
With that said, if the Durango had the ecodiesel option we'd have purchased one. It seemed like a nicer platform (I know its basically the same). As stated, seats were more comfortable, looks better in RT trim, and the ride was better. I think the Hemi RT is a great Tahoe/Expedition alternative.
I think the explorers are my least favorite, too feminine looking.
Tim, look into a Q7.