I RECIEVED AN ESTIMATE FOR A NEW GAF ROOF. MY HOUSE IS AN INLINE HIGH RANCH. THE ROOFER WANTS TO REPLACE MY VENTS WHICH HE SAYS ARE INDUSTRIAL SIZE AND NOT NESSARY FOR MY HOUSE. HE IS GOING TO REPLACE THE VENTS WITH RIDGE-VENTS WHICH HE SAYS ARE BETTER AND ADEQUATE FOR MY ROOF AND ATTIC WHICH HAS A CENTRAL AIR UNIT IN IT. HE IS GOING TO PUT TWO TYPES OF UNDERLAYMENT AND AN ARTICHECTIAL STYLE ROOF AS PER GAF CODE. ALSO HE IS GOING TO DO A RIP OFF AND CART AWAY DEBRIS. HE IS GOING TO REPLACE ANY WOOD THAT HAS ROT OR DAMAGE. HIS ESTIMATE IS 4600 IS THIS A FAIR PRICE ? AND IS A GAF ROOF BETTER THAN A REGULAR ROOF ,SHOULD I HAVE HIM REPLACE MY VENTS