Whether your arrow be carbon, aluminum, or wood, they will all shoot well if tuned correctly.
In fact most will shoot better than you can shoot and so the differences are unnoticeable.
As for the material that you use each has it's pros and cons.
Wood is classic, beautiful, very traditional, and is known for being quiet. However, they are not always known for being as durable as carbon and aluminum, and they require re-straightening.
Carbon is tough as nails, is straight, and known for consistency in lots. Cons: It is the most expensive, can be tough to tune.
Aluminum is tough as well, does not require straightening, and is cheaper than carbon. Cons: Aluminum is not always as pretty as wood, as tough as carbon.
It is a matter of opinion which you choose. If you already have some aluminum then I would stick with them.
3RiversArchery.com carries the Easton Legacy arrows that you already have and they are great to deal with. (Though sometimes a tad bit more expensive so shop around a bit. I use 3 Rivers a lot because they have treated me so well. It is worth the extra $$.)