What you really want is a high sensitivity speaker with 16 ohms and of course Field Coils if you can raise the budget higher.
I use Atma-Sphere OTL Amplifiers called the Nirvana, these are not posted on Atma-Sphere sites but can be custom built on order. It pushes i believe about 140 watts on the 16 ohms 100db Field Coil Speakers.
In the past few years my upgrade bug has been totally cured :-) i never think about changing speakers or wandering what others may sound like or what am i missing. Its been a long 28 year journey with lots of headache buying and selling speakers and amplifiers. Finally for myself in my treated room i can finally just focus on collecting and buying music instead of electronics.