For my side neons, i used automotive duct tape and fashioned my own lip to extend the tiny one the LS has, just attached part of it and folded it over, making sure not to leave seams in the tape. then i used my color matching spray paint i used on the interior and painted and clear coated it so it blended with the car, it was a cheap easy functional and looks good.
As for exhaust, a lot of balt owners are fans of the Tsudo N1, which is a great buy for its price, though i cant say how it sounds bc mines getting shipped to me this week, but its an easy two piece bolt on set, and you can go loud or soft by removing or inserting the silencer in the tip.
As for the tails i dont think you should worry about getting smoked ones, they can be smoked/tinted and still let good light through, i believe the law is 500 ft visibility at night. And i have nightshades on mine, a lot of it, like blacked out, and ive never had any trouble for them.
And i know nothing of halos, just that they require additional wiring, but theres a lot of how to's and videos out there that explain it