For a player around your rating, what is the point of playing 3 openings as White!? If you play 1. c4, and 1. d4 for instance, that is enough in and of itself to keep you busy studying for years. To learn all of the theory and ideas behind 1. d4 alone is quite a bit, but 1. c4 and 1. d4 work nicely together because of the various transpositional possibilities available to you, so it's doable.
In my opinion, you'd do quite a bit better to stay with whatever your first two are, since they're invariably (probably) better 1. b4, and study those, along with some middlegame and endgame study. You're not going to get better by adding a crappy 3rd opening to your repertoire, but if you for some reason are a glutton for punishment and enjoy that kind of the thing, the more power to ya dude!