Adhesive, grout, which is best

I'm going to start tiling my bathroom in a week or so and have read with interest a lot of posts on this great forum.
I'm going to aquapanel the 'shower area' and board the rest where required (some of the existing plasterboard was obliterated when i removed the old tiles!)
I'm using 40cm x 30cm tiles, i'm going to use powdered adhesive and grout but what i want to know is which is best for the job?
Is BAL much better than dunlop?
Which adhesive has the best 'water resistentness' ......
Any advice, greatly received, this will be my first tiling adventure so be gentle,

Cheers

Don't worry about using Bal on walls - any branded adhesive should be ok (except unibond..... I have a great dislike for most unibond stuff). It's just on wooden floors that I won't use anything but Bal.
You're using large tiles so just make sure that your walls are as flat as you can get them for easier tiling.