For general use, I've found nothing better then PG tips (lots of milk and sugar, please). My old call, before castaway converted me, was hot choclate -- not hot coco. It should be made with one glass-full of milk, and a tablespoon (heapingness depending on where in the box you are) of Nestlé brand Quik powder.

OTOH, for occasional use, I like "French Vanilla", that you get out of vending machines in the US (which probably has little to do with anything the French, in fact, drink. However, the best stuff is Starbucks White Choclate Mocha. Also, if they still have it, in the cold cafenated wing, Arbie's Frappachino is quite good.