An APU simply includes the GPU and CPU in one package. If I'm not mistaken, the A10 6800 is top of the line at the moment. Kaveri will soon be it's succesor.
If your brother knows his stuff, then get him a gift certificate to his favourite hardware store.
#1: FX-6350, Antec Kuhler 920, MSI 970 Gaming, Asus 5870/V2, ASUS Xonar D2X, GSkill (F3-14900cl9d-8gbxl), Antec Truepower New 750, Arc Midi, Win8.1pro x64
#2: MSI A88X-G45, AMD A10-7850K, IGP, Antec900 case, AMD 2x4GB 2133 (R938G2130UK), Antec 750 True, 128GB Sandisk SSD, WD Black 1TB, Win8.1pro x64
#3: Athlon 64 X2 4200+, AGP 1950pro, Audigy 2, Asus A8V-D, 2gig ram, Enermax 465P. Now on Win8.1pro cat 10.2