[lunarhighway]

that actually looks pretty good, most aerodynamic cars and suv's seem to have an undertrat that angles up to meet the front bumper in the middle, i think the rounded transition won't be a bad thing, and the ribs are nice too.

what you may want to do is add some extra dams in front of the tires, google some random suv pictures or even recent sedans ( a mercedes c class for example)
and you'll notice the center of the airdam is a little higher and seems more inviting to allow air undermeath in a smooth way, but the area in front of the tires and suspention looks more agressive and obstructive... you don't want air to flow into the tires it seems. it looks like the sides of the dam don't cover the full width of the tires.
you may want to try flaring them out somewhat if possible, or adding something to them to achieve the same effect, but than again, adding the dam will improve over stock and without a wind tunnel perfect aero will be impossible to achieve anyway