Tonal Landscape

Even though I haven't had time to sit down and actually compose music for several weeks, I have been mulling over the third movement (Fire Fall) of my string quartet. Most vexing right now is what tonal landscape I want to use. I want E to be the tonal center, so I have thought about using some sort of Phrygian mode. I like the lowered second. This morning I am listening to Stravinsky's Symphony of Psalms for tonal ideas.