If you are going to get 6 bottles experiment a little and try some from different areas with differing flavour profiles to see what else you like or dislike.
Given that you like Glen Moray and Dalwhinnie you could try the likes of Balvennie, Glenfiddich, Glengoyne (18 yo is very nice), Macallan.
If you wanted to try something slightly more peated then Highland Park, Talisker or Bunnahabhain would be worth a taste.
Heavily peated options like Laproig and Lagavulin are very peaty and not to my taste but worth a try in the pub to see if you like it.
If you like a coastal tipple then Oban, Old Pulteney or Scapa are my personal favourites. Old Pulteney 21 yo is my all time favourite. Bit pricey though.
Don't discount Irish whiskey, it tends to be triple distilled and very smooth. Jameson, Black Bush (both blends) and Bushmills 10 yo malt are all excellent.