the best company is Soulution, reasonnable expensive price........and as musical as dartzeel and FM, more power tahn Dartzeel.....
have you heard the darTZeel NHB-458 monoblocks?
i own the dart stereo amp, and had the 458's in my room for a month last year. best amp i've heard. it does everything with a sense of dynamic grip and ease combined with the darTZeel delicacy and nuance, yet with tube like body and foundation. a combination of attributes not previously heard from a high power amplifier.
i've only heard the Soulution last year at RMAF, i did not care for the room overall in terms of price/performance, the amps seemed quite nice but hard to determine specific amplifier performance contribution at a show.