I am looking to buy a used 3 series.

Found a very clean 2002 325 sedan.  Looks good all around but (forgive
me) I ****HATE***** the base wheels that come with the car. They look
very generic.   I really like the sport wheels that come with the
2004-2005 325, and even the sport wheels that came with the 2002 325
look pretty good.

Can I change the wheels out without any suspension modifications?  If
so, will the stance on the car be the same as if it had the sport
package (i.e. I don't want the wheels to look awkward on the car)?
I think the base wheels are 15 or 16" - the sport wheels are 17"?

Has anyone done that?   Also, does anyone know where I could go on the
net to purchase factory BMW wheels?

Any insight would be greatly appreciated.  Thank you.

Brandon