Hi Benjamin,

There are more Picea breweriana dwarf forms then the one's you mentioned.
-Kohout's Dwarf'
This one is found by Jörg Kohout from Eastern Germany and does have a globose form.

-'H.B. Wüstemeyer' aka Zwf. Wüstemeyer (='Zwergform Wüstemeyer'
This one is found as a witches'broom by Werner Wüstemeyer, also from Germany and grows like a miniature conical form.

Others are:
'Emerald Midget' aka 'Buchholz Dwarf'
Found by Talon Buchholz from the U.S.
The growing habit is like a small pyramidal form.

'Mt. Lure W.B. Seedling'
I don't know it's origin but I can image it's also from the U.S.
Till know it grows like a tiny globose form.

'Nana'
I don't know it's origin, but it growing habit is a nice globose.
{{gwi:640859}}

'Rhemland'
It's found as a witches'broom in the Czech Republic.
Till now it's still a very little one, can't say nothing yet about it's growing habit.

I have these in my collection and all are real beauties!

Hy,
sounds like 'Zwergform Wüstemeyer' is a good choice!
Good to know that there are more cultivars!
Thanks.

Benjamin