Since I do not think it was mentioned, the Tascam HS-p82 is 8 channels of wonderful mic preamps. A little bulky by today's standards, but if it is for stationary music recording, it does a great job. And it is very affordable these days.
Nagra VI is also great. Sonosax is likely the King for the absolute highest quality mic pre in terms of being super clean. But the Tascam pres are great and euphonic, for lack of a better decription.