os makes some good engines. they make some not so good ones too. i had bad luck with their .46 la, and i have heard the same story from many. but i have heard good things about the .40. i would get the .46 fx or the .50 sx ringed. the .46 is cheaper, the .50 has 15% more power with about the same fuel consumption. The la's don't crank out as much power, but are cheaper. the fx se4ries has a fuel metering carb, the la doesn't. the la also has a plastic backplate. My second engine was a .;46 fx, and it was just a wonder. the instructions say you only need one tank of fuel to go through it because of the precision equipment they have. they are actually right. one tank, and it would not die when i gunned the engine (i did adjust the low end) and the needle setting only really changes the second, third, and fourth tanks. by the 5th tank, it is as broken in as it will ever be, and you can idle it down pretty low. the la took a long time to break in, and ultimatly vibrated it's own prop loose and ruined it. as about the radios, i would reccomend a computer radio. you will see why when you get your second plane, or put in 2 aileron servos, or have to mix. futaba makes a 6 channel one, it's good to start with. hitec also makes one, but i have never used it. by my third plane, i was hitting it's limitations though (i had a cap 232 which i fully loaded with gadgets and high performance parts so it required a better radio) so i sold it. for $50 difference, i bought a futaba 8u. they are incredible. they have every function you will need unless you get into battlebots or jets. because they stopped making them and started making the 9c about 6 months ago or so, you can probably buy it used for pretty cheap. mine was used, i bought it for $200 while they still made it. don't go too cheap in the beginning, it will become more expensive later.