Hello,
I have a few Masdevallia. Maybe you should say what your temperature range is and humidity and other growning conditions... Here are my recommendations:
Masdevallia herradurae is easiest for me to grow and bloom and therefore one of my favorites.
Masd. tovarensis is easy to grow and is forgiving. I have had one for a couple years and although mature, I haven't bloomed it yet.
Masd. June Winn is pretty easy but I think it does prefer cool to bloom.
