I had a chance to drive all the TRD Pro trucks at the media launch in early May. My favorite of the three was the TRD Pro 4Runner.
With that said, the price of admission isn't cheap and as you noted, $50k for an off-road truck seriously limits the buyers' market to those who have the dough to play. The alternative is to pick-up the suspension a la carte at Toyota dealers this fall. The suspension is what makes this truck so attractive as it was purpose-built specifically for this vehicle and handles like a dream in both on-road and off-road applications.
You can read my overview of each truck in the latest issue of OutdoorX4. Print copies are available at most major book retailers or you can pick-up a copy or subscription from the website at http://www.outdoorx4.com.