To be honest, the only thing you are getting with an aftermarket bumper is increased DRAG with absolutely no improvement in AERO Dynamics, more weight, and less durability than the stock urethane bumper and less quaility over the stock bumper.
What's with the wide mouths, additional side vents, etc with all these aftermarket bumpers?
Do you like showing off your washer fluid container? or the A/C condenser?