Youre probably better posting
the same question in the multihulls section. Here discusions are mainly related to the area and im sure you can find out marina prices for yourself and are asking in a more general context regarding the boat itself.
One bit of advise I can give you that is relavent to the area is to search out those marinas
that don't charge extra for catamarans as this will make a HUGE difference to your annual costs. Alot charge an extra 50% but some charge double!
, Almirimar and Sant Carles are three I know off the top of my head
that don't charge extra for cats.