most 'snipers' like to stay concealed and only go AEG when they get spotted, slinging a sniper and carrying a full length AEG doesn't work all that well.
Check out the M14 for him, G&G or marui - both have 'issues', but nothing a bit of work can't fix. Check out airsoftGI.com for G&G M14's.
WGC is nice, lots of stuff, but shipping can be quite expensive, so expect that, and duty taxes after you get the package, so...
Marui makes good guns, can't go wrong there, but anything with a metal body can be argued to be a bit better, CA comes to mind here.
Exactly what kind of guns do you want? CQB? long range? long rifle? sniper? gas? electric?