High quality themes

Hi there,

Can someone with experience recommend me some good theme developers, who do really profesional and high quality themes, that I can check it …

(I mean really stable quality developer, who do great themes longer time, some WordPress themes titans 😉 )

…
I have more website and really need some advice about themes.
I use always core themes like twenty twelve, fourteen … and I m happy with them, bc. so simply and clean, fast … I modify them.

Just now need some quality themes for some new websites, but I m totaly lost here.
Tried to search in ”Themes section” but these free themes looks for me almost the same, just with another colour or font and some extra bugs and worse performance and stability …

Then I tried to search some paid themes … uf so hard, tons and tons themes and that is not possible to choose there.

Its really to choose quality theme if there is milions in portfolio and from demo many looks well, but I need also which works well and fast, not only first impression.
So that is, why I ask for some bigger and stronger developers of themes for WordPress. Sure anybody can do great theme, but I really dont have feeling to test them all 🙂 So prefer ranked quality stable developers for it.