If you are auditioning AudioNote amps, check out the Oto and Soro; they are a bit more than the Cobra but are much better. In the Cobra’s price bracket, the Synthesis Audio integrated is much better. I heard them side by side in a direct comparison playind Audio Note AN-K, Harbeth 30.2 and ProAc Tablettes. The higher up Synthesis amplifiers, like the A40 or A!00 models are better still and can anchor a truly great system.
Triangle speakers do have a slightly bright top end, but with good tube amps, they should not be harsh. J.M. Reynaud speakers are a bit warmer and also good. I would add ProAc to the list of speakers to audition too. For something different, see if you can audition the open baffle speakers from Pure Audio Project (maybe st a show, I think they sell direct). Their Trio 15 models sell for around $7500 and are shockingly good for the money.