Just get the stock 18" to be used later on as your winter tire set and buy an after market 19".

 

my plan is to use the 19"coupe wheels for summer tires and then put the stock 18" All season wheels and tires from the sedan on for the winters, which are mild, plus I have an SUV for snow days.

If the wheels for the 2009 sport package didn't look like they belong on a Buick, i wouldn't even have this issue

 

i'd recommend all 4 fronts or 4 rears but people have been doing the staggered which I don't recommend but it's not my car

 

How come? WHy not recommended? Does it affect the AWD system somehow?

It is much cheaper to buy a used staggered set from someone upgrading to aftermarket rims than to try to find 4 fronts or rears out there or paying dealer price per rim....