Just bought a 09 Ram Hemi, tonneau cover questions...

I had an Extang Black Max on my Dakota and really liked it. It is a soft top secured by snaps.
Good points - it only took a minute to roll it up if I needed the truck bed, on the interstate it improved gas mileage about 2-3 mpg; no increase intown or on country roads though, it was water tight, it had easy fastener adjustments to allow for cold weather, it took the Georgia heat and sun for 10 years before the threads on the edges wore out. I plan to replace it with another Black Max. They are also pretty inexpensive.
Bad points - it did require regular maintainence by using "303" every time I washed the truck, even though the fasteners adjusted for cold weather it was a ***** to refasten if you unhooked it during the winter.

One other thing, about 3-4 years into my ownership one of the snap fasteners came off. I called the company and they shipped several replacement snaps, a special tool to install them with and a sample bottle of their cleaning and treatment - all free.

Your new truck is a beauty.
C