Learn all of Op.2. The etude is the star piece, obviously, but the Prelude in B major and the Impromptu a la Mazur in C major are also good, and none are hard at all. I agree with RnB, though, the interp on Op.2 No.1 can be a little tricky, but not any more than most of Scriabin's other works.
Also, check out Prelude Op.51 No.2 in A minor. Judging by your interest in the Op.57 pieces, I'd also look at some of the other late preludes. Many are hard, but I'm sure some of them are manageable.
Phil
Afterthought: are you interested just in his late music, or in everyting? Because everything from the unpublished Romantic pieces to the F#m Concerto is very Chopinesque, including the Op.3 mazurkas, the Op.8 etudes, the Allegro appassionata Op.4, etc. He begins to really show his colors after the Concerto, though, and they change through his middle period until he discovered quartal harmony. That's where the innovation really takes off.