I'm a certified CI DENON integrator, and here's some extra info about the Denon Models. First off NEITHER model is "current" anymore. The new AVR-XX12 series is the latest from Denon.
They replaced models as high as the 3311, but did not overhaul the 4000 and up. However, expect to see a new upper end model positioned between the amazing AVR-5308CI, and the AVR-4810, coming out probably early next year, or by christmas time.
The 4810 came in LATE 2009, and is now 2 generations old (the new AVR-XX12 series is shipping now).
The 4311 is still available, but in VERY limited quantity according to DENON. (My Los Angeles based install firm has ZERO left in stock, and we will NOT be receiving any more from DENON, as they are no longer being produced).
I hope that doesn't ruin your plans for the receiver. If you can find a dealer who still has the AVR-4311CI, pick that puppy up cuz it BANGS.




