If navigation was totally out of the question, would you rather have your D3 or get the new model that looks the same but doesn't have Navigation, USB and IPOD capable and only has 2 pair RCA audio outs. It seems like it has less RCA's out the back altogether.
I really like the USB, its cheaper and it may be better then adding a CD-UB100 USB adapter to a AVIC-D3. But I would have to Y the front RCA to my 4 channel amp to have sub control too. I alos wonder if the firmware is better, learing from any issues with the previous models.
I can get into a new AVIC-D3 for about $450 plus the price for a CD-UB100. The new model is gonna be around $500 retail maybe so the cheapest cost would be maybe $450. The same I figure.