Ontario for the North thicker also check Condor, if your Veggies are Greener {soft} lighter weight Blade[faster] also understand that your arms will feel it with a longer heavier blade over prolonged use
http://www.ontarioknife.com/machetes.html
Info on Machetes to help
http://www.machetespecialists.com/
Look here for Mods and Use to help your decisions before you buy.
http://www.youtube.com/user/Colhane