I am in exactly the same predicament as your son.
I am 17, 158 Pounds and 6"00
I have skied all my life (mianly in AUS, I know shocking snow but condemmed by birth) but have been til now to scared to race until now when I finally releasied that I can easily beat most of these people, the only thing stopping me before was a pathetic fear of failure (my dad raced in the world cup AGED 14!!! made the Winter Olympics as a DH and GS skier at 16!!) albeit this was in the 70's when skiers were much younger (all breaking their backs by 25).
I have skied on Atomic my WHOLE life, but I am not impressed by their GS Skis (too stiff). I demoed some Fischer two days ago and ADORED!! them. At my race club 60% of people are on Rossi's (sponsorship is the main reason 20% off) but still they have strong support. Almost no one skis on Atomics quite a few on Fischers, My mate who is ranked 3rd in Aus tells me that Blizzards are amazing..