What amplification would fit Tannoy td12

I realy like Tannoy td12 and need to make sure the play at their best.Now I have Naim cds2, Cr developmnet Romulus modified.I listen all types of music from classical,jazz to electronica,experimental but mostly progrock and 70's rock.I don't know if the tube integrated amp from England is pushing them enough to make them really sing.After 9 o'clock position seem to distort a bit.Tannoy's are 92db efficient.I am thinking about some Densen,maybee Sugden or going back to Naim amplification (Naim seems to me too pricey ).I like to spend up to $3000 used.Maybee if i spent this amount I will not see any improvment in sound.Maybee I need to choose diffrent route like going with some very powerfull integrated?Can someone advice I am very confused.When I heard those big systems in listening rooms I was not very impressed that's why I never obtained these big machines Krell etc. That also why I have what I have but sometimes when I want to play music very loud (like going mad on some heavy rock)I can't and that's what really botthers me I guess.