Body kit buying questions

What are the good brands in body kits?

Is there a material that's better than others? (fiberglass, etc)

Does it matter whether it's gel coated or some other form of primer?

How much does it usually cost to have a body shop install a full kit (front, rear, 2 sideskirts)?

How much does the paint job usually cost to match the kit color to the car?

Thanks a ton.

I haven't really done too much research, but In my opinion, the Stillen one is the best looking. Not too sure on cost and what not, but its good looking.

Polyurethane kits are the best. They are pliable and less prone to cracking. Fiberglass kits crack very easily depending on the thickness. Stillen is made of poyurethane. Most others are fiberglass. A kit install will run you anywhere from $250-$500 depending on what you want done.