Personally I am not a fan of any of the official bottlings from Auchentoshan, so I wouldn't recommend it, but I know others enjoy it so it could be worth a try for you. The American Oak is quite heavy with the bourbon influence, so it would be different from what you have had at least. I'd be looking at something heavily sherried, like a GlenDronach, an unpeated Islay like the Bunnahabhain 12, a Cambeltown like the Kilkerran 12 or Springbank 10, if you are wanting something a bit different from what you have already tried. As for adding water, it depends on personal taste and also the whisky. Higher ABV whiskies sometimes need some water, sometimes they are fine neat. Personally I'd say play about with it and see what you think, try each bottle at least once with water. A single teaspoon of water can make a huge difference, sometimes it can open up the aroma and taste, others it can emphasise one and dull the other, or can kill both. It can be an interesting experiment to pour two small glasses of the same whisky, add water to one, let them sit for a little while and then compare them. If you are adding water start off small and add more if it needs it, it's like salt while cooking, you can always add more, but you can't remove it. The only proviso I would give regarding the use of water is if someone tells you either that you must add it, or never add it, they are probably best ignored, with taste being subjective whether you will prefer it with water or not is different for everyone.