I've been researching through many heads and my budged is $600 max. the Head has to be powerful enough to push my SWR Triad Cabinet rated 400W @ 4 ohms. After looking though many heads, SWR 550X, SWR WorkingPro 400, Ampeg B4RE, Ampeg SVT-3 PRO, Gallien Kruger 700RB, 1001RB, EBS Fafner, Genz Benz Shuttle 6.0 Among those heads, which would be best? I'm looking for the tone that is not too Hi-fi or not too muddy. And something versatile that can fit from RHCP to Hillsong to R&B. So far I'm leaning toward SWR 550X, GenzBenz Shuttle 6.0, and Gallien Kruger 700RB. Any recommendations/opinions regarding some heads I listed?