I use
D'Addario EJ15 for acoustics, although I get them in a 3-pack for $12 from musiciansfriend.com. They're a bit expensive on Bajaao, but you can check out
the EJ10 & 11 selling for 270 bucks. Alternatively, you can buy the less expensive
Granada strings and see if they work out. I haven't used Granada so I can't say much about them, but if your bro likes them, great.