I like the Alpha 40, I dont have any experience with the other two, but, I would say any of the three choices are good ones.

The alpha 40 comes with a 7 ch RX, and the engine is very powerful and user friendly. I learned on the Alpha and now have the 40 and 60 size Alpha.

I think you would be very happy with it and the engine and radio would go into you're next plane whatever it may be.

I have seen Alpha trainer RTF packages on ebay for as low as 250.00.

If you look into this link you will find one with slight box damage for a little less. I think you would be very happy with this setup.

http://horizon.hobbyshopnow.com/products/attic.asp