I think it's going to be Teela's Unicorn Charger. Toyguru seems to love Teela, concept and early MOTU stuff. Since Charger can be made from the Swiftwind buck, it all makes sense to me! Charger was even in the latest issue of the DC Comics, MOTU mini-series.
Arrow (for Bow) or Strydor (for Fisto), would be my preferences though. Not that I don't WANT Charger! I just want Arrow and Strydor a bit more.