Simon pop into the great outdoors and look at there range, you'll notice straight neoprene deck which are a waste of time in my opinion, since they show no resistence to scratches and scraps. . . . .
then you have re-enforced decks, of varying toughness.
this will give a taste for what prices of decks are brand new.
look a second hand deck, and if its in perfect condition take about 50-60% of the cost of it brand new.