Lamm M 1.2 against Tenor 300 and Boulder 2060

I own a system based on Avalon eidolon with Halcro electronics,EMM labs and NBS black label and Kharma enigma cables.

I´m insterested to change the electronics for the a hybrid amp, as Tenor 300 or Lamm M 1.2 or for the Boulder 2060.

I will be pleased if you can help me, almost I´m interested about to know how compares the Lamm M 1.2 and the Tenor 300, also one important consideration for me is the relation price/sound quality, the Lamm seems to be less expensive, around 40% than the Tenor.

I demoed the Boulder, sounds well, but not much much different or in another league than my Halcros, which is your opinion?.

Finally which preamp do you think I will need to be used with Lamm M1.2 or Tenor 300, new CJ ACT2? Aesthetix? Wyetech? CTC? Connoisseur? Lamm?

Thanks to all for your advice.