I agree with alandamp about the THX certification - it's pretty much just a marketing gimmick. I've got a 4306, too, and I love it. That's not to say I wouldn't like the Pioneer just as much, but it wasn't around when I got the Denon. Face it - all the receivers in this price class are going to be pretty much outstanding performers, so pick the color, features, and deal you like best. You won't be disappointed.
BTW, I like the Denons remote just fine, but only use it for initial setup. I have a Harmony and Home Theatre Master I use for daily system operation.