Go with a name brand, use there complete line of products, primer, primer - surfacer, top-coat. This way if there's a paint failure you can go back to the supplier and they might help. I've always had good luck with PPG, Sikkens, BASF. What ever your painters happy with. Transtars a good line too. Not as expensive. To paint a car up here a full line of Sikkens will cost you around $4500.00
The Old Tinbasher