MF Tri Vista or Nu Vista Amp or Pathos Logos


I wonder if MF Tri Vista better choice than Nu Vista providing that both amps will easaly drive my present speakers.
Heard that some of the NuVista's produce a hum in the speakers and Tri Vista is more reliable.
On the other hand some people say older MF models are better than newer.Can't compare both side by side so
any thoughts would be appreciated.
Also consider Pathos Logos.
Can this one compete with Nu/Tri Vistas.

Thanks
kdbg00
Ever tried Accuphase?
Accuphase produces some of the best integrateds in the world, for the price you pay for Nu-V or Tri-V, you can get an Accuphase E-407/408, or even stretch a little bit to get the E-530.
I own the tri-vista integrated amp and it is superb. I think it in some way it is better than the kw 500. I think the Nu vista is probably a little more "colored" but others may say the opposite is true. The Nu vista was also available as reasonably priced separates. I think that you should get the one on which you can get the best deal because I doubt you would be disapointed with either, and if you are you can likely flip to the other at little additional money. They are both excellent
The Nu-vista sounds more smooth and involving than the tri-vista.But the Tri-vista has more control and drive in the low freq. The sound is more analytical than the Nu-vista is. In some situations It can ben a little harsh. I did a lot of demo's for the distributer of Musical Fidelity, so I know them both very well. Why where you disapointed in the kw500?
Leonx, if you've heard the KW500, then how would you compare it against the Nu-/Triv-Vista?