If you are on a limited budget, a 4 channel will work just fine. Contrary to popular belief, 6 channels are not mandatory. Many (most) people never use more than 4 channels. If you think you will have enough money in the next few years to have more than one flyable plane, or if you think you're going to get serious about aerobatics or 3D, then you might want a more expensive radio. Otherwise, a 4 channel will do just fine.

You can also save money by not buying an electric starter. They are not required. I have 2 of them, but they almost never go to the field with me. I hand start all my engines. A hand cranked fuel pump is fine. Propellers are not included with the plane.