I definitely like a lot of the minor scales and variations, but I find myself drawn to chromaticism, both in melodies and in harmonic movement. Also, being a monk fan, a well-placed whole tone scale run never fails to delight me. I'm also a fan of the diminished scale (alternating half and whole tone steps, aka octatonic scale), and, as you might guess from this expressed affinity for symmetry, I'm favor tritone substitutions. Slonimsky's Thesaurus of Melodic Scales and Patterns was kind of my bible when I was writing more and trying to be a bebop alto saxophonist; it pretty much sums up modern/symmetrical melodic movement from every possible angle.
Metal. 