Hi akkra,
According to Hinson's repertoire guide, the three editions still available now are Belaieff, Kalmus (now owned by Warner Bros. Publications), and International Music Co. (now owned by Bourne). I have the Kalmus here at home. Let me say this about Kalmus. About 20 years ago, I tried to avoid Kalmus, as pianists threw as many rocks at them as at Schirmer, and justifiably so. However, over the ensuing years Kalmus cleaned up its act considerably, and its editions have gained more respect now. But if you want to go to the real source, sign on to the IMSLP website, click on composers, then Scriabin, and then the Fantasy Op. 28. There is the Belaieff edition that you can download and print off. Beliaeff was one of Scriabin's early publishers, as well as being a friend and benefactor to the composer, especially when Scriabin was short of cash, which was frequently. You can't go wrong with Belaieff. Incidentally, I briefly compared page 1 between Belaieff and Kalmus, and it appears that Kalmus used Belaieff as the basis for its edition. I hope this helps.