Hey cam, where you thinking of doing this? I'm guessing at Alltracks Academy in Whistler, no? Been thinking of heading of there this year to, but going to spend most my time in France this year, so maybe next year, might make a trip to Whistler to check things out this year.
Things you should look into, will you be able to use your CSIA certificate in the UK/France and so on if you want to? Cause maybe if you want to work in Europe to you might be better of with BASI?!.
For me doing the CSIA courses would just be a good excuse to spend a season at Whistler, if I need other certs to get work around here I'll get them, don't mind the little extra money, but when you're younger you might want to look into it a bit more. (although I'm pretty confident Canadian certificates are widley accepted, but not sure).
Then, when you've got a Level 1 you'll only be allowed to teach childeren and complete beginners, with your Level 2 you'll be allowed to teach more advanced courses (don't know the exact details anymore), so what is it you want to do? Teach people and kids the absolute basics, or also teach people to improve theirselfs to advanced skiers? (from my experience in diving, teaching people the basics gets boring pretty quick!)