Tom, Jescar who makes EVO fret wire supplies it in wide range of sizes such as:
-Height-Width
-0.037-0.080-
-0.043-0.080-
-0.047-0.095-
-0.047-0.104-
-0.055-0.090-
Traditional flat top fret wire is 0.037 x 0.080. Many luthiers use 0.043 x 0.080 as their standard fret wire. It is just a tad taller but maintains a traditional look. Typically, taller frets (>0.045) are preferred by string benders and they also sound clear with lower left hand pressure (what Juston likes). Narrower frets tend to intonate a bit better (and hold it longer) but they can wear faster. As wider frets wear (which tends to be a slower process) intonation issues tend to arise. Like all things guitar, choice of fret wire has its plusses and minuses...