Sounds like you already heading in the right direction.

The all chrome Tahoe style grille shells looks good on there. You could replace the billet with a tighter billet insert (basically has more bars in there to fill it in better), and do a billet bowtie. The paint matched bumper top pad along with a new bumper should complete the look really well. Throw some 2003 and up Silverado tail lights in the back. Color matched door handles, tail gate handle and bezel would look good as well. I really like the stance of the truck as it is, I'd go with some Tahoe LTZ 20's....