You should not need a graphics card , but if there is room in your budget you will slightly increase system performance because you are freeing up system RAM . You may also get rear panel connectors that the motherboard does not have like display port . But either way you wont need to spend more than about $60 on this part
well if he uses any programs with cuda then a 550ti is a nice gpu, if not actually even a 7750 is good to go, and seems he won't be playing games or if he do just casual flash games or those some newer games that doesn't require competitive playing.
so a 7750/7770/550ti should be well good enough for his usage
edit: I thought so someone would slap in intel ^_^ well he wants amd let's give him amd, there will be not much big impact on performance with what he is going to be doing,
ocz psu is not so bad at least better than generic, and it doesn't seem like he will be going with intense gaming,
as he did mention normal usage = flash games (maybe), facebook, youtube, surf surf, minesweeper, solitair, chess or maybe some good old counter strike, nothing heavy so yeah amd is good enough for him, he doesn't need intel unless he is so uber over a few seconds speed increase on some parts.
he can even go with any generic psu as it also works out, but I do like the sound of seasonic, corsair psu,
antec is ok but most of it is crap,
actually to save money he can even live with gt 210 or something even if he doesn't game he can always go for the older cheaper gaming gpu's.
edit: actually I'll even go with what he put up there compared to some stuff I I see on the mall selling pentium g's with 1gb ram and stuff. for 437.93$ (saw it yesterday afternoon and made me feel like WTF) well it's build already and it's a mall so it's expected to me more expensive but yeah ahahaha could build something cheaper with better parts quality for the same price.