It has to be roundwound, and stainless steel; nickle dies on me too quick. I would like a string with solid mids, but not at the expense of bass or treble response, so looking for an even response across the tonal palette. Even tension across the strings would also be nice. Want then to be stiff enough to be punchy with nice harmonic overtones, yet loose enough for a clear fundamental tone; too much harmonics tend to weaken the fundamental to my ears. Also would like the string to retain it's tone for a long period of time, but I don't like coated strings. Does this string exist, or am I asking too much of a mere piece or metal?