I just finished up my bachelor's in Math and Stats, starting grad school in Topology at Mac...so I may be one of your TAs this coming year (:
Math and Stats is a great program. Class sizes are fairly small, which is great as there are plenty of opportunities to get to know your professors.
I'm personally more interested in "Pure" math, and that's what I specialized in, but math can be broken into three major streams:
Pure Math ('theoretical' or 'abstract' math)
Applied Math ('solving equations' or 'applications to biology, finance, etc.')
Statistics (quite different from math)
The first two years of math shouldn't be too difficult for you if you enjoy Math. In third year however, you will be forced to sample a bit of everything, and will really get your first taste of Pure Math, in a course called Real Analysis (I posted a review in the course review sections here:
http://www.macinsiders.com/showthread.php?t=2145 0), and this is where everything changes. You go from 'computing' to 'deriving' and 'proving' things.
Some people dislike / can't do this kind of math, but lo and behold there are other options for you if that's the case! Although it's really not too bad. (:
If you're in Applied Math, or Statistics, you have a vast array of jobs at your disposal, even with just an undergraduate degree. Jobs in finance, modelling etc.
If you're into Pure Math, although you can potentially get the same jobs, you come to realize that after a bachelor's degree, you really don't know much pure math. These courses lead excellently into a masters / phd program.
Applied Math and Stats also have masters/phd programs, but I think there aren't as many students registering for those.
Let me know if you have any questions about a prof or course. (:
