Your poll really depends on many factors.
If you are set up to run nitro with cars then you probably have most of the support equipment to move over into nitro planes. If that's the case I would say look at a nitro plane. The Nexstar is a good plane BUT it's overpriced (new)in my opinion. Try looking for a used one as a lot of time folks buy that  Nexstar package , hardly use it, and then loose interest. There are other nitro trainers as well like the Tower Trainer, SIG Kadet, and others.
Buying used nitro trainer planes is usually a good and cheap way to get into flying as sometimes you can get everything you need; plane ,engine,,transmitter, etc...all together. Eventually you can upgrade to a better transmitter if you stick with it.
If you were just starting out I would say look at an electric RTF package like the Eflite Apprentice . It's a good trainer and is a plane you can stick with as you improve your skills (just like the nitro Nexstar, Kadet) and you get everything you need including a decent 2.4 transmitter, battery, and simple charger. Eventually you could upgrade to a better transmitter and charger if you stick with it.