I would probably go with the 243 in Stevens! I know my first gun was a Marlin Model 60 SB with wood stock and after about 2-3 years of hard hunting, the stock was getting pretty rough looking! So go with a synthetic for a first gun, cuz a wood stock will get messed up more! not that a synthetic wont, but its not as noticeable! So, i guess, take him somewhere like gander mountain or cabelas, or bass pro shop, or to any other gun shop (that has a large selection) and let him try them out!! Then shop around for the cheapest prices! Also, if you happen to live around a shooting range or club, take him by to see if anyone has one that he can shoot a round or two to see how he handles it!
Just my $.02!
Andrew