I personally got the 243/20 combo youth handi rifle for my son 2 years ago when he was nine. I will never be an actual fan of the 243 but I must admit that it has done a very nice job on the two deer he has shot with it.
He is eleven now and our next move will be a 7mm-08. I dont know your sons size or age but if he handle the 08 Id pick it and if you wand a shot gun as well then go for the 243 combo.
It has been an exdellent and accurate rifle,just have the chamber polished before you get started or the rifle brass wont eject.