I agree with everyone on the tint. EVERY vehicle I've ever owed has had 20% or darker window tint, even the wifes car has it. I had my suburban tinted within days after buying it, same goes for the wife's car. We had it in the tint shop with less than 20 miles on the odometeter.
Another must have for me is remote start. I've installed one on every vehicle I've had since 1997 (thats when I did my first one). I guess I'm just spoiled with it by now. It comes in real handy when its 90 degreez outside and I can start my truck to get the AC blowin cold by the time I go get in. And also when its freezing outside and I can remote start it while I'm still getting dressed and have it nice and toasty by the time I go get in it to leave.
My third must have (and I'm sure those with small children will most likely agree) is a DVD player. It keeps the kids quiet, nuff said.