I'm exploring the best of both worlds using an MC 901 mcIntosh amplifier. biamping capability allows mids and tweeters to receive tubes which are better for harmonics in that area and solid state for the bass which requires more power to bring it out. The dedicated amplifiers to each of these areas appears to be a really good thing.
Also using NOS small tubes is really cool too.
I also have solid state amplifiers which are gathering Dust in another room. And they were very nice with plenty of power and very cool temperature wise.