The DHT-487DV was a HTiB and you're dealing with what, five year old technology? By putting everything through your television, you're asking a sports car to be a pickup truck as an AVR is the home theater work horse while the television is a sports car with a utility rack. Buying a current receiver will upgrade the whole home theater experience or, you can stay with trying to use your sports car as a pickup truck. Yes, it can be done.
In other words, what afrogt posted.
Home theater electronics is the type of pursuit where, like it or not, periodically, one is going "HAVE" to upgrade their receiver. That's just the way it is and yes, manufactures do it on purpose to keep our cash flowing in. Personally, I find it to be a win/win situation in that they get to have access to our hard earned money and we get new, cool toys to play with; win/win as old technology is obsoleted out and new technology is ushered in. That's just the way it is and when one spends effort trying to find workarounds to new technology so as to recycle old technology to save money, that's all they're doing, kidding themselves as they bust their tails to find workarounds to prevent having to succumb to the need to upgrade to current technology.
(The above does not apply to hobbyist who revel is playing with old gear, for the sake of playing with old gear.)
FWIW, with the recent purchase of a Marantz, SR5007, we upgraded our home theater AVR to current technology. I love our SR5007 and after using it for a couple of months and surfing the web in detail to help with other people's questions, nothing has succeeded in turning my head. For me, personally, I find the SR5007 hits the perfect price/feature middle ground. We made the purchase so as to upgrade to current technology and we purchased with the understanding that three, four or five years down the road, once again, we'll be on the market looking for an upgrade to accommodate future, yet to be created, technology. The point, that's just the way it is.
My concern for you regards the AVR2312Ci or the AVR2313Ci due to the lack of a full set of pre-outs. Should one later decide they'd like to upgrade to an outboard amplifier, unless I missed seeing a full set of pre-outs on the back of the unit, well, let's face it, without a full set of pre-outs, the buyer of the unit is SOL. In the case of a Marantz, SR5007, it comes with a full set of pre-outs and to me, this is a very, very, very important future casting feature. What good is life if one doesn't have the option to upgrade their amplifier section?
In the end, I encourage everybody to do what makes them feel all warm and fuzzy inside.
Hope the above rambling insight helps answer your questions and concerns.