Well, the term "dual elevators" is used in the feature descriptions of both the Futaba 9C and the Airtronics RD8000. The Futaba 7C does not have this feature (ask me how I know), and I didn't see it listed in the feature description of the Hitec Eclipse 7, either.

In the JR lineup, you have to go up to the 9303 radio system, although it boasts dual channel funtionality for "all primary control surfaces" so you could run dual servos on the elevator, rudder, and ailerons if you wanted to.

If you want a full featured radio that will support dual elevators, the Airtronics RD8000 is the best value at about $250 through Tower Hobbies after discounts while the JR 9303 is the most feature packed. The JR 9303 and the Futaba 9C are a pretty close match at the $499 price point, with both available as synthesized frequency systems with synthesized PCM receivers included. The JR seems to boast a few extra bells and whistles, but I can't really imagine being unhappy with either radio system.

The RD8000 is no slouch though. For $250, it's easily one of the best values in the whole marketplace for an advanced radio system.