RE: 7mm08 for my son
7mm-08 is good choice IMO. 140gr Barnes TSX would be a great place to start as far as bullets for the elk hunt. However their are many others in the .284 line that would also work ie: failsafe, nosler partition, etc 140-160grs.
As far as brand one that hasn't been already mentioned is the Rem 700 SPS, several variations to chose from in terms of fit/finish/features.