I've never heard any of the amps you mention but I just read this review today that's germane:
http://www.hifi-advice.com/blog/review/analog-reviews/amplifier-reviews/primaluna-dialogue-premium/
I'm a fan of Christian Punter and Hifi Advice he seems to be a pretty straight shooter and really comprehensively tests gear in different combinations. In the above review he even tests the Primaluna with a pair of the larger Vivid speakers. Good luck!
http://www.hifi-advice.com/blog/review/analog-reviews/amplifier-reviews/primaluna-dialogue-premium/
I'm a fan of Christian Punter and Hifi Advice he seems to be a pretty straight shooter and really comprehensively tests gear in different combinations. In the above review he even tests the Primaluna with a pair of the larger Vivid speakers. Good luck!