hi i have just been told that my dual mass fly wheel

will need replacing soon as its making a noise by a mate who is a mechanic.
car is a 51plate with 132k on clock standard car, would like a bit more power but i think the fly wheel thing will cost a bit of cash which was for a r-tech remap.
first question what sort of price for the fly wheel and do i need anything else while it is apart?
second question is do i realy need a dual mass fly wheel or is there some thing else i could use which would not need one?