if I went with the Denon 4311 I probably wouldn't need a separate amp. I would like to go with the emotiva amp $700 and a receiver for $600 -1000.
I would look at the entry level AVRs that offer preouts. Then go from there to see which ones from Denon, Marantz, Onkyo, Pioneer and Yamaha that have the features you are looking for. Many good choices in your price range.