Hey Natchie... I just picked up a D702B from a seller on Ebay. Folks are funny though, because I see the units go for a variety of prices.
They seem to be moving at about $200-250, but the problem is that they aren't imperfect, and they've often been handed from one user to another in trade, and then put up for auction. You're likely to be getting a unit from a secondary or tertiary seller. My own unit was from (at least) a second owner. However, the seller was a JVC enthusiast and he vouched for features to be working. My unit was missing the front input door, but I may actually have found the parts to it.
If you get one be sure to read some of the tips for keeping it cooler. So far, so good for mine. I plan to be using it to play back decoded DTS HD master via LPCM from an HTPC. I'll be dead in the water if I want to go to 3D, but I don't really care about that just yet; I've a component system that's all JVC (save the television). The compulink system has been awesome, up until now.
My RX-8000VBKJ had text compu-link and syncro compu-link jacks. I use a TD-W354 cassette deck and although it indicates it has syncro-III, I previously connected it to the RX-8000VBKJ's text compu-link jacks for interface. While the RX-8000VBKJ remote could make a tape start/stop/record/rewind, it did not have a dedicated remote power button. The RX-D702B won't talk to the cassette deck at all so I'm trying to track down an aftermarket remote.