Your first build is fine. But I agree about not needing the gpu unless you are gaming. And like the others I'm not a fan of the power supply. But I'm not as against using a cheap power supply with a cheaper PC as many people might be. If you skipped the graphics card and went with the above mentioned 2400g I would think a cheaper power supply would be fine (Not preferred, but if you wanted to save the money you could get away with it).
Why they are recommending the 2400g is because it is very decent for multi tasking and it has the best built in graphics of the cpu's. So if you did want to play some games it can handle them at lower settings.