pronane

I am looking to redo the bathroom in my flat, and different builders and forums are telling me different things so I'd like to get some honest experienced answers. The bathroom will have at one end the bath and the shower at the other end, its a narrow rectangular shaped room about 1702mm width and will be 2286mm in length when knocked through. I have been told to use a variety of things so finding it difficult to choose as theres no site detailing pros and cons of which just one user over another saying something better without saying whats wrong with the first one thats mentioned. Some of the things mentioned, aquaboard, hardie backer, delta board, cement board, jackoboard. I was told that you only need aquaboard for the shower area and bath and not the whole bathroom itself? Also is it better to use hardibacker and cement board throughout the other areas and then tank it rather than using aquaboard at all? The reason I am slightly apprehensive is there is no window in the bathroom and its near the kitchen(kitched is directly behind it) so it will always be moist and damp can easily arise, so given that scenario I want the most water/moisture resistant, over say easiness of putting up and tiling on? What are the best options above ? Based off the following two requirements which would be best: 1. Room with no window, beside the kitchen so lots of moisture/potential dampness 2. Ease of putting up and also tiling onto, which doesn't require skimming/plastering or tanking? Thanks