Quinto,
> Because of a relatively low budget I wanted to dig deep in commercial devices specs so to avoid spending all our money for a single esotheric preamp. <
There you go.
> I hate closed systems. <
Me too.
> NO tube mics <
A man after my own heart.
> These are point very different from what the market shows today, this is why I would like to discuss about them here. <
The market is wrong and you are right. But as an engineer you already know that. Conventional wisdom in audio is mostly stuck in the 1400s, where magical properties are valued over decent product specifications. What matters most is having good loudspeakers properly placed in a good room that's properly treated acoustically. As Craig Anderton (EQ magazine editor) once wrote, "No listener gives a rat what mic pre you used."
--Ethan