I'm just about to sell a CX2 with 3/lipos and upgraded rotor shafts.
Like you, I've got an RC aircraft background.
I started with the CX2 - it's inexpensive, tough, and parts are available at most hobby stores.
My recommendation is to buy at least one additional battery, buy aluminum upper and lower rotor shafts (they stock ones will sheer) and sets of upper and lower bad.

From the CX, I went to a blade (with the help of a sim) - it makes the blade look like a simple toy and requires a *lot* more attention.