Exhaust Manifold

Hi Everyone, this is my first time using this site, just like to say from reading other threads that its good to see everyone helping each over with all the different problems.
Ive had a Renault clio 197 for bout 2 years now, never had any problems untill now, the exhaust sounds as if its got a huge hole in it, took it to my local mechanic and he said u need new exhaust manifold ;/
Decided to take it to the Renault Dealer in the area for 2nd opinion and they said the same thing.
Im not sure what to do now ? For brand new exhaust manifold looking at £700, is it best to go get 1 2nd hand? Would like some advice as i like the car very much. Thanks for your time

Sion