Well, i have this arpeggio. 96bpm, goes 6 octaves up then starts again.

PS: If someone cant see the pic, it goes E two beats, D two beats A two beats and F# two beats.
How i can harmonize it? Tried a bunch of chords but i didnt like them. I wich scale? Would you change something of the arpeggio and then harmonize it?
Thanks in advance.