Receiver options
Since most you are not to concerned about having HDMI 1.3, the newest video processing, etc. look for a discount on last year model. Several manufactures including Yamaha and denon are releasing new gear this month so look a deal on a Yamaha RX-V2700 or Denon 3806 or 2807. With street prices on the Onkyo 805 of <$900, it is also a great option.
Above this price range, most of the additional features are for video scaling, networking, EQ, etc.
If you are content with the feature of your current receiver, consider getting a 200 Watt 2 channel amp to driving the new Kef speakers.