Thank you for your feedback and appreciation. Since your contest is in "Selection" phase, only the 1st ranked designer may submit new designs during this phase. So, in order to see revisions, you may simply rank one of my designs in the 1st place.
LogoTournament allows us to deliver the final artwork in 2 filetypes: .eps and .jpg. After the contest is over, if you want, I can send you other formats directly to your e-mail: .ai, .cdr, .gif, .png, .pdf...
Regarding your other question, the answer is yes, the .eps has transparent background.
Thank you for showing such interest in my design. Regards.