Do you want to build it or do you want to assemble an ARF (Almost Ready to Fly). ARF's are mostly built when you get them. You have to join the wing panels, install the engine and gear and a few other things.

My suggestion is that you build your first kit so you know what's inside a model. Also, a trainer is tolerant of building errors where more advanced models are less so. If you plan to build planes later, then you should start with your own trainer so your skills are ready when you move to more advanced models.

If you never plan to build then an ARF is a good choice. It depends on what you want to do.

If you want to build, then I have a page on my site that gives recommendations of good trainers.

Radio Control Training Aircraft