I'm not sure what your needs are, Black Davy, but if this is for serious theatrical use, you might want to consider a high-grade aluminum bladed sword of the sort made by David Baker or Tony Swatton. (Thanks to "The Touring Gentleman" for reminding me where the latter site lay.)
I'm not in the "biz", but I'm "virtually" well aquainted with some folks who are, and they maintain that aluminum (were talking very high-grade aluminum used in the aerospace industry) offers significant advantages over steel for theatrical fighting.
Both of these men have made swords for some major productions (Swatton did POTC, and the upcoming M&C/FSOTW).
These will cost significantly more than a costume sword, but less than many really good steel reproductions (I'm thinking of some of the prices I've seen for Baker's work here--don't think I've ever seen Swatton's.)