Should I get a medium bob?!?

I have longish hair about 4 or 5 inches past my shoulders. I have golden blond hair and a very round face,some people say that I have a little redish tint to my hair but its VERY subtle. I wanna get my hair into a long bob at a slant( i dont know what to call that?) And get copper red highlights... will it look good? Also i kinda have a large frame(kind of fat :( but that is why im debating on it cause if you get short cut hair when your overwieght it looks bad like your hips grow? IDK please help!!!!!! p.s. my logic is hard to follow basiclly some people look bad with short hair when they are fatter... :(