aquaboard is great for wet rooms and bathrooms a little more expensive than your normal plasterboard, so if cost is an issue aquaboard the areas that are going to be most likely to be in wet areas. If you intend to tile on to plasterboard a little trick is to cover the area on the board you intend to tile with hardboard as it will prevent damage to board if/when you decide to rip tiles off agian in the future.
Alternative to plastering walls, would be to joint tape them and fill out with jointing compound this will involve two or three application and some sanding down, best to use with tapered edge plasterboards, you can board internal of windows (the reveals) and the ledge too, you would need to put angle beads around these edges to give good finish, when work is complete and you are ready to paint i'd always recommend a good contrators base paint as first appilaction.
i hope this was usefull information any more question do not hesitate to reply.
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