Okie,
First let me tell you that I have six 25 cal. rifles. your choice of 25/06 is a good one, however if your son is not stout for his age he may struggle with your selection.
I had read much of the criticism of the Vanguard rifles. Since it was the only "economy" rifle that I could find with a 24" barrel I bought one($400 OTD). After some trigger spring replacement it shoots half-minute at 100yds with 110gr Accubonds. Now, these are handloads. I know nothing about factory ammo. I do know,however, that whatever rifle you choose you will need to shoot a variety of ammo to find what your rifle likes. From conversations with hunting friends the 100gr Remington Core-locts might be a good place to start.
Thus far noone has suggested the Stevens 200. At less than $100 more
it is twice the gun than is the Savage AXIS. I have used three 200's to build "poorboy customs". The only downside I can see for the 200 in 25/06 is its 22" barrel and that is not a deal breaker for me.
What ever you choose, you need to get it done and get as much range time as you can in order to make a learned ammo selection.
GOOD LUCK and GOOD SHOOTING!!!