I am driving a pair of Totem Tabu's (86db 6ohm), similar drivers, with an un-modded Cayin TA-30 with good results. The Cayin is very similar in design to the PrimaLuna, and I am either upgrading to a PrimaLuna or getting a modded Cayin in the near future. It is quite an impressive design for the price, although I have not heard any of the other amps you have mentioned.
