The new Archos models and "PocketDish"

[SteelWheel]

I just got a Dish Network 625 receiver yesterday. This is one of the models that has a USB port on it, enabling the use of what Dish calls "PocketDish". This was apparently just a rebranding of three models of the (somewhat older now) Archos players--the AV300, AV500, and AV700 units.

All three are listed as sold out, at least for purchase via Dish Network's web site (although are available on eBay, and elsewhere on the web if one hunts around). Before I go and actually buy one from eBay or similar: What about the newer Archos models (404, 504, 604, 704)? Do these also allow the user to sync the device with the USB on a Dish network box in the same way? Or is there something special about the AV series from Dish, which makes this the only way to go?

Thanks folks.