Well theres a big difference between Size 11 and 12 boots, so you really need to figure out exactly which one it is..and what boots hes going with..i know a lot of burton boots have low profiles to actually be smaller than the same size boot from another manufacturer...
Also his height/weight/price range would be useful ..if he only has 200 bucks to spend what board he can get is entirely different than if he has 500.
'09 151 Never Summer SL-R
'10 K2 T1 DB Bots
'09 Burton Cartel Bindings