Without knowing what you want it for, how old your son is or what your budget is it's a little hard to make a suggestion since there are literally a million .22's out there........

If you want something hunting oriented and higher end that he will cherish for life here is what I put together for myself:

http://www.huntingnet.com/forum/tm.aspx?m=3124129&mpage=1&key=&#312412 9