The alpha is a RTF trainer from hanger9. This thing should have balanced out of the box with everything installed.
Well, on second thought, I see you said ARF, not RTF. Therefore, you're putting your own stuff in it. What engine did you use? The evolution is a farily heavy engine, but not 11 oz heavier than other 46's. Aside from moving your battery up, you don't have much other choice but to use weight in the nose.
let me restate that--you have plenty of choices, but none of which would be real good for a beginner. Some choices are:
1) Lead weight in the nose (easiest fix) after moving battery as far forward as possible.
2) Weighted prop nut--will decrease performance substantially in a smaller engine.
3) Move throtle servo to the front--but this might be impossible with the fuse cheeks on the Alpha.
4) Get smaller, lighter servos--the servos for this plane sit behind the CG, so lighter ones will help, but will set you back another 75 bucks or so. The HS 81's from Hitec will operate this plane beautifully, but--like I said--will cost you more. If you're going to spend another 70 bucks, then you might as well spend it on suggestion number 5:
5) Get a bigger engine to help balance it.

Of all of the suggestions, I'd think number 1 would be the most logical for a beginner flying a trainer. I still can't believe this thing is that tail heavy. You are sure you had it at the correct CG?