Thanks for all the help folks. Got the speakers and a denon 2310 (on sale for the same price as the 791), and the new setup is deafening and quite nice. I'm no audiophile, but I put it through the paces with a variety of music and movies and I'm very pleased, and based on advice here, I didn't bi-wire, didn't spend cash on expensive speaker cable, and things are good.
The jbl's are great across a range of different inputs.