I've just posted a reply on your other thread, stay with the radio that comes with it for now and see how you get it, it's fine for that plane.
If you then stay with the hobby and are looking to upgrade your plane maybe look at it then and the best advice is buy the best you can afford, I've got 2 I don't use along with my SuperCub and ended up with a DX7 but could have saved myself the expense of the other 2. DX6i is another to consider down the road.
Really do look at a Simulator though !!!!!