My advice should be taken with a grain of salt. I think it helps to have multiple certs and qualifications as it gives you credibility. I don't know about Can-Fit, but NASM and NSCA are two excellent organizations.
The reason to take it with a grain of salt is because I am quite successful doing what you are talking about, and all I have is a standard cert (with NFPT), no nutritional certs, and I'm a college dropout to boot, so I've made it work without all that stuff, but just because I did it that way means I necessarily advise others to follow my example.
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Jean-Paul Francoeur
www.jpfitness.com
http://forums.jpfitness.com
"Twenty years from now, you will be more disappointed by the things you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbour. Catch the trade winds in your sails. Explore. Dream. Discover."
-Mark Twain
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