Just as a point of interest:
You cannot build a pure transport player for either Blu-ray or HD-DVD. In order to meet the minimum Blu-ray spec which is now Profile 1.1 ALL players have to include some decoding capability, otherwise 1.1 features such as picture in picture would never work. For Blu-ray that means every BD player must decode Dolby Digital, DTS core, and support 5.1 PCM as a minimum. It must also support mixing decoded primary streams with secondary audio else it cannot be profile 1.1 compliant.
Therefore (and if you read pages 11 and 22 of the 2500 manual) the DVD-2500BT is not purely a 'transport'. However, like the Panasonic DMP-DB30, it only supports on-board decoding of the minimum spec.
Yes I know that for some people, not having HD audio from the movie at the same time as PiP is no big deal, and great, honestly I'm made up for you. However, I suspect for many other people they would prefer to have the player setup and then leave it alone, knowing that they don't need to fiddle with player settings to change audio output if they want to use extra features but want to keep the main soundtrack in HD... Especially given that for BD-J movies, resume play is not supported.
I don't see why that 'simple' requirement should force them to the 3800 if they don't need HQV, AL24, high quality audio DACs and analogue video out options. It would also allow those with HDMI amps that can only accept PCM to have a cheaper in with HD audio.
By the simple addition of HD audio to PCM decoding, the 2500 would satisfy MANY more people, perhaps justify the price tag, and not break it's original intentions given that it already does decoding because ALL players have to, to some degree.
Is it really that unreasonable, and isn't making HQ playback to the widest possible audience a good thing? How many non-HD decoding HDMI Denon amps are there out in the wild?