hiya guys, ive got a zetec turbo in my 2litre mondeo

my coolant pipe burst on the m25 and my hg is fooked, alot of people have been telling me to get the thicker 1.5mm hg, but ive heard that the standard ford item is the best?i want to run 13psi max and i really dont want the head gasket to give way again, so im looking to uprate as many things as i can afford at the moment

any suggestions would be great

(not posted this in the other cars bit as its very rare to find anyone with a turbo'd mondeo)