Here is a visual for your first question - angles are not actually calculated but the general idea is demonstrated.
As far as the brands go - all those brands will produce good images - I suggest again that you go to a good camera shop with your camera and take some macro pictures with each and see what you think! It will only cost you some time at this point.
In general though the lenses that cost more do so for a reason.....whether or not each is signicant to YOU is up to you to decide.......