Well. in regards to the rear of the truck what tails you get will depend on the look you want to achieve.
- You could color match the D pillars and spoiler and get a nice set of led tails.
- You could go on a full escalade rear end mod like I did, with Escalade D pillar appliqués, escalade 3rd, and escalade tails. You could upgrade to the escalade rear bumper but since you prefer black to chrome that would be going in the opposite direction.
As far as headlights there isn't much available in the way of mods other than getting the Denali housings instead of the base ones you have on now. Aftermarket headlights for these truck have terrible output to the point of being unsafe. Of course if you have 1000 or so bucks burning a hole in your pocket you could always get a projector retrofit.
24s are big ... wheels that big look better with a drop imo, but there are many folks that run them without a drop.
If it were my truck I'd swap those gigantic side moldings for the newer more elegant version ... they come with or without chrome. Or you could demold/de-badge.