First I say dont replace your interior unless you do a factory quality replacment. It seem that the First or second thing people notice when deciding weather your boat is a POS or not LOL. A cheep interior wont help you on re-sale either.
I have heard getting Factory replacment skin's from my dealer is hit or miss. But your dealer might be diffrent and might have better luck. I would say try to get the factory stuff first. Check on
www.planetnautique.com you can get some good contact's for older Nautique parts there or
www.correctcraftfan.com Im guessing you can spend $1500-$3500 and UP No problem for a complete interior replacment.
I know its around $600-$800 just to do the carpet. Let us know what you find out