I'd have to go with Sudtipos, love the styles offered.
Roboto, my favourite
Linotype, but in this moment i love HDV
Commercial Type for me.
Lineto, Commercial, Klim and Process for sure.
HFJ, Font Fabric
FontFont and ITC
Too many to choose just 1! Font Bureau, Typesetit, Laura Worthington
Loving Klim and Colophone and FontFont lately!
Lineto, Klim and Underware. Bold Monday also has some really nice stuff, especially love Macula.
I recently discovered New Letters, from Germany.
Font Smith & Lineto
Hoefler & Frere-Jones