If you want to stay solid state and better that the odyssey's maybe models of jeff rowland 6,8 or 9's might work for you;I have not heard any of the models you listed except; I did own a pair or mccormack dna-1 mono's driving a pair of merlin 4b+'s and it was a very very good combination.Maybe even talking with Steve McCormack would let you know how his product match your speakers.
The Manley Neo 250's I think would be very close to the manley ref 440/200 mono's I had driving my current speakers soundlab m2's;using the pentode mode was fine with 440 watts but the triode mode was more sweeter in the midrange and high's as it should be being in triode configuration;amps were built extremely well and I had no performance issues in the 2 years I owned then.
As far as your room is concerned it might be worth doing some frequency room analyzation with tones,pink noise and a spl meter to see if there is a area of your listening enviroment that has major deviations from the rest of the room;it doesn't take long to do and won't break the bank.