Sounds big! If you're looking for a vocal for this track, I think it should be something simple, rather than a full verse & chorus vocal... think Axwell "In My Mind", where it's just one phrase. Apart from that, one minor comment is the key part at 1:37 - I think you should use the more staccato version you have coming in at 0:30. The more legato feeling it has at the moment is a bit too chill I think. That part could also do with some chorus or reverb or something to make it feel a bit more wet. Nicely done!