The Meguiar's Gold Class is a good shampoo, also have a look at Dodo Juice Born to be Mild. I always seem to recommend this shampoo on here but it really is an excellent product.
Red Mist is a great product for topping up your protective layer in between waxing, and also leaves a great finish, just make sure your wax layer has completely cured before using the Red Mist.
Again, you have picked a good product in Colly 476.
Basically I can't really argue with the products you are already using. I've never tried Mer so can't comment on that. Maybe someone else can?
Chris