Have heard Audiolab 7000a, Atoll IN 100 and Roksan (K3 and not the attesa). These amps tend to favour clarity and resolution (read bright in certain play backs) and I wont call them warm in any sense of the term.
Open up vocals and warmth (being your specific requirement) in solid state amps is usually a hit and/or miss. If I were you, I would go pre-power and introduce a tube preamp (says a tube preamp of 6n2p/6sn7 tubes) to get the midrange bloom and wramth. Looking at your budget, only Accoustic Portrait Swara Tube Pre/Power comes to my mind. But you can venture deep.
I am not suggesting any good tube amps (integrated or tube pre/power) since your choice of speakers are not exactly tube amp friendly.
But a tube pre and a SS power may just do the trick for you, given your preference.
On a side note: I had demoed R3 Meta at Provfx, Bombay. Lovely speakers. Cant go wrong with them. I drove them with Tube Amps (EL 34 making 40 odd watts). They sounded just fantastic albeit a little sacrifice in bass agility. Mid range clarity and vocals were fantastic.
Cheers.