With the investment you made in the 4306, you probably should keep it for now and revisit this dilema in about 12-18 months. At that time there will be a lot more options with HDMI 1.3, HD-Radio, DTS-MA and Dolby-THD.
BTW; the Denon 4306 is HDMI 1.1 comliant, not 1.2. I have one currently, and I will be changing it out for one of the 3 below;
If you want to move up within the Denon line, then the 4308CI is the HDMI/1080p compliant contender to the 4306, and it retails for $2500. It includes 3 zones, 140W, WiFi, HD Radio, and all the goods. It's available now.
Onkyo is another option, the 875 or the 905 are your best bet. The 905 includes HD Radio, and it will retail around $2000. The 875 doesn't include HD Radio, but has pretty much everything the 905 has. The 875 is available now, but the 905 hasn't yet made it to store shelves as far as I know.
The Pioneer Elite 94 model is pretty comparable to the Denon and the Onkyo, but there is no HD Radio option. It retails for $1600.
The big difference between these guys is the Reon QV scaler in the Onkyo vs. the Farouga DCDi chip in the others. Arguably, the Silicon Optix chip is superior to the Farouga, but I don't know if it really makes that much difference. I think the HD-Radio feature is one that is attractive for me and may likely push me to buy the Onkyo when it comes out (supposedly this month).