I'll second the The AVA Insight control (integrated) amp. Very neutral and all solid state. I have all three of the Insight products (DAC, pre-amp, and amp), the units arrived about 3 weeks apart with the DAC showing up first, then the amp, with the pre-amp arriving last. Each piece brought my system closer to a neutral sound.
The DAC made a big change, its sound is very clear with deep bass and no added warmth. Frank hit a home run with this design.
The 440 amp made a small change to my systems sound with slightly less warmth, my previous amp was an Anthem PVA2 which is still a wonderful, smooth sounding amp that adds just a hint of warmth to a system, it would be perfect for a lean, overly bright system.
The Insight EC pre-amp made another big change. The synergy with the other Insight pieces is immediately noticeable and the combination is magical. The three units blend into one cohesive unit to produce a well defined sound stage with a pure sound. I was listening to "One Second" by Yello (vinyl) yesterday afternoon, volume was about halfway up, which is very loud, and the very fast drum thwacks and bass lines were clearly delineated with absolutely no brightness. Shirley Bassey's voice soared and the driving rhythms rocked the house.
Wayne