Having been in your situation (I went from nitro CP heli's to planes), I would NOT look at a trainer at all. IF a local club has an in-house trainer for noob's to learn on, have a couple of flights on that first, as the feel of the trainer is a little different to the sim - as I found.
Now the reason I say don't buy one, was that within less that 2 minutes of flying my one for the first time, I knew I wanted more as the trainer just felt numb and very dull to me (nitro CP heli pilot remember).
After the trainer was squashed by a falling bookshelf from one of the earthquakes we had down here (a year ago Dec 23rd), I got a little Yak54 and set it up as a low wing trainer (in that the control surfaces are reduced to almost nothing), and found that a much better option moving forward.
Not only did I get something to learn tail dragger skills on (next step is a gas powered P51), I liked the way it felt in the air a heck of a lot more than I did with the high wing trainer in that I had to fly it, just like I do with my heli - I guess it offered a more familiar feel, well to me at least.
The other beauty with going that route (tuned down Yak or alike), is that the plane is as tame as YOU want it to be, and as you grow, then you can just reset your travel limits on the TX, and you have a whole different plane, which in turn saves me having to buy yet another plane later on, which to me makes a hell of a lot more sense!