Howzit, thanks for the comment on the shootout, we need to do another one!
There's some good info on paddles on this thread:
www.surfski.info/forum/index.php?topic=16.0
Check out that info, then talk to some guys like Mark Lewin, Oscar, Darryl Bartho, they're all friendly guys and will give you advice 'till you ears fall off.
Check out the paddle selector on the Epic site as well:
www.epickayaks.com/home/paddle_wizard.aspx
And on the Knysna Kayaks site, they have information that at least allows you to compare the sizes of the blades.
cheers
rob