Go for the Techo Block Gray large blend---or post photos here so we can help.

I have no idea and not about to go searching for each tile you mention Post pics here of the exsisting choices and the ones you still need to choose .

Having owned pools with different colors ( from cobalt blue to very pale gray ) “waterline” tile I would select the lightest due to hard water deposit issues. Of course a pic would help if your question is more about aesthetics.

It would also be helpful if you posted photos of your pool gunite color.