Hi Amanda!
I guess all I would add is that generally the better the equipment the better the sound - whether it be sax, mouthpiece, whatever.....
It is not that beginners would not appreciate better stuff - anyone will appreciate better stuff. I guess, as several people have said, it is cheaper to start with mouthpiece, reed and ligature as they can all make a difference, As far as I am aware the Academy saxes have a reasonable reputation.
Once a beginner friend of mine visited with his Stagg Alto, on which he used a Yamaha plastic mpc, cheap metal ligature and Vandoren traditional reeds. He tried out all my set ups and was overwhelmed with his sound once he had found a different combination - in this casea Ponzol Vintage HR 0.070 mpc/Francois Louis Basic Ligature/Francois Louis Excellemce reeds.
The point is that these are relatively cheap ways of upgrading (I have a Runyon 22 mpc and the Rico B5, prefer the first by a long way). Sax wise it might be an idea to try a few different ones to see whether they make a noticeable difference or not. but the other stuff can often be more important as we do not necessarily know what size of mpc is best, or sounds good to our ears as it can take time. Good luck whatever you decide - I'd just recommend being open minded.
Kind regards
Tom