Get into is a difficult question because the cheapest RTFs are all electrics yet to get a electric trainer on par with say a 40 size trainer will be much more expensive.

I would say that the most important thing is what you plan to do in the future. If you are going solely electric then you can invest in an electric plane and purchase quality accessories (batteries, chargers, ESC). But if will be doing the some electric some nitro or all nitro, I think a nitro 40 size trainer is the best bet. They are among the easiest planes to fly and you can get any pilot of any experience to help you out with a buddy box.

If you are still confused, why not go to the local field and just check it out... there just may be someone that can show you both and maybe even sell you one for cheap!