I was/am a nitro heli pilot who went over to his first plank a little while back (a 65" '40' high wing trainer with a .61 2 stroke in it).
While I agree there is a little to learn re handling differences etc, if I was to do it again, I'd go for a good '2nd' plane (hangar 9 Pulse XT or Great Planes Revolver), or even a warbird over a trainer, as the second flight was all it took to know that the trainer wouldn't last long before I was wanting to upgrade.
I'd get what you want, and buddy-box with an instructor and use your sim (most heli pilots have them) to gain that required 'feel' until your at a point you can safely go solo.

Just my 2 cents worth.