I enjoyed my time with MC 275 MKV, but not sure it will provide enough current for your Dyn’s. Music Reference RM200 can be had at reasonable prices used and is designed to be used with speakers with demanding current requirements.
http://www.ramlabs-musicreference.com/music_reference_rm-200_hybrid_power_tube_amplifer.html
http://www.ramlabs-musicreference.com/music_reference_rm-200_hybrid_power_tube_amplifer.html