Which Lens Hood for 650D (T4i)?

I have the same 18-55mm lens as you, and I found that on the extreme 18mm setting the lens hood gets into each corner the picture.   I have tried both petal and circular hoods and it happens with both.  I have to move the focal length up to at least 24mm to prevent this.   So make sure you try the hood at this setting before you buy one!