First of all, it's a truck. You're never going to get a "smooth, luxury car-like ride" in a truck. But if you want better shocks for the street, look at Monroe Sensa-Trac/Rancho RS5000, or Monroe Reflex/Rancho RSX. The S-T/5000 and the Reflex/RSX are the same shock marketed under different brands by the same parent company. Lots of varying prices. Do a search on Froogle.com for the best prices.
I personally have the Rancho RSX shocks. Any aftermarket shock is a vast improvement over OEM shocks.