As an AME I spent 4 of the first 6 years in the industry on the road. Came close to wrecking my marriage.
Take a good, hard look before choosing aviation - in whatever job description. Unless, of course, you enjoy low pay, erratic shifts, lack of job security and being away from home a lot.
Good engineers leave this industry constantly due to the above. A highly adaptable lifestyle and personality is much more important to success as a mechanic than the ability to fix stuff - don't let any egomaniac tell you otherwise.
If, however, after all that you're still foolish enough to want to do this then I agree avionics is much better than mechanics (provided you have a bit of aptitude for it).
Don't get too hung up on which school. Go to the one you can afford. BCIT ain't special. SAIT is probably the best in the west but you don't really start learning until the first day you are responsible for an aircraft with your ink-still-wet brand new AME license in hand.