I'm surprised that no one has mentioned Paul Hayward maker of Silkstone Whistles. I haven't tried the PVC models but the have the alloy D, Low D & D+ models. Brilliant intonation, superb balance between the octaves and very sweet voice.

My 2 cents, David

P.S. Shaws too breathy for my tastes. Nice reedy sound though. Dixon's I also find too breathy. Not a lot of character IMHO. Would never spend money on another Howard after the badly out of tune rubbish they first produced and then refused to allow a trade up when they eventually began to make playable whistles. Not exactly good business practice. Still have that P.O.S. model kicking around >:-p