Aikidoka, people who practice aikido, have a lot more work and experience with bokken (wooden swords) than with any live swords. Granted, there may be a few here with knowledge regarding katana's, I would still recommend another sight: e-budo.com
I'm not knockin' anyone here and certainly not aiki-web... but ya gotta go where the resources are.
PS: You mentioned competition, what kind of competition is that? If your talking sword on sword competition of some kind... do NOT go cheap! One broken sword and your dead! eep!