I have a Chieftain F, which I love the tone of, though it is an aluminium body. With hindsight I would have bought the tuneable version as mine is slightly flat.
At the top of this forum there is a whistle makers thread listing various shops. The list is a bit dated however many of the whistle makers are still active. You could breeze thru and see who makes what keys and types of whistles.
Modern Players/bands, Lunasa etc, use them a lot. Increases popularity, that. And they’re Low-ish without the stretch of the D. It’s a handy format to play. Middle ground. If you’re into that sort of thing ofcourse ( I realise this thread is about high ones).
I believe these guys were playing Fs there (I may be wrong though):
Not with an F. I had a D for a while though. It was a fine whistle but between the price of it and the cost of his preferred shipping it turned out Very Expensive. And I eventually sold it on to recoup the expense.
I would suggest you try your Generation F first. They’re lovely little whistles off the shelf and given the use F whistles normally get I wouldn’t recommend spending ten to fifteen times the price for any other whislte.
I have a recent (maybe 5 years old) high F brass Generation that’s one of the better stock Generation whistles I have. For the price, it’s worth giving it a try. Chris Abell makes a high F whistle if you want something higher end. https://www.abellflute.com/whistles
Edited to add:
Humphrey whistles are some of my favorites, but I’ve only ever played his high D models. They have very balanced octaves (strong low D without the high B being too harsh or hard to hit). And, Gary’s a swell guy!
Many years ago an experienced whistler mentioned to me that in his opinion the D was the poorest Generation size.
He said that it was the only size that didn’t have its own dedicated tubing-size and head; rather, it was merely a stretched Eb.
He felt the bore was a tad small (in relation to length).
I don’t know if it’s true, but he said the original Generations were Alto/Soprano pairs Bb/Eb and C/F, each whistle being designed from the ground up and playing nicely. (Of course D/G are likewise an Alto/Soprano pair.)
Does anyone have early Generation literature with which to discover if there was a period when the D wasn’t made? Or if that guy’s theory was hogwash?
In any case you’re not alone in your rankings. I’ve often heard a preference for Generations in Bb, Eb, and C.
Personally my best-playing whistle (in any key) is an old Generation C. I wish I could find a D that plays like it.
I found one made by David Furman in Argentina. He calls his company Clover Flutes. He posts on the Chiff and Fipple Facebook page now and again. He uses aluminum. It sings.