First off, I've had my car start with 2xx some cca'* before. Yea, it ran like crap and anlmost died while starting, but it started.
Since you live in MN (where the cold winter days get COLD)the more CCA the better. I believe mine has around 800 CCA'* and Inever have a problem turning it over on the coldest days.
Now my truck has some cheap a$$ battery with minimal CCA'* in it. On a day below freezing I have about 4 seconds to get it to fire before you can hear the starter slowing down from lack of juice.
_________________bottom line, the more CCA'* you got, the less jumps you'll be getting.