Looking for an incredibly dynamic preamplifier


I'm looking for a dynamic preamp that provides plenty of attack, great bottom end, and an iron-fisted grip on the system. The best I've heard so far (and by a long shot) is the Wyetech Labs Opal.
I would assume that other units with robust outboard power supplies are good candidates? Maybe a battery-powered unit like the new DartZeel pre would qualify?
Thanks.
exlibris
Again, need you a 5th recomendation FIRST SOUND after multi others the best yet.
I also 6th the First sound as a preamp.Dynamics are tyed to the amp as well, but your grounding scheme has a huge impact on it.I love the tone and timbre of the FS and you get to roll tubes in it as well!! Good luck on the hunt Dennis