Quite frankly, i think the OEM "filler" is the best option of all, and it's at the lower-end of the cost range for something to clean up that hole. Not my truck, but here's a "stock" photo showing the OEM bumper 'grille' ...

 

I was going to put boost bars on until I realized it was going to cost just as much to add a 20 LED light bar. I should be installing the light bar in a few days. Not a bad option in my opinion either. I don't think the light bars look as nice, but there's more of a function behind it.

 

I ordered mine from ebay for 220$ not bad for the quality of it.