Need Opinions on Staggered Setup

I have a 2012 328XI E91 Sportwagon with a staggered setup on performance tires.( 225/45/17 front - 255/40/17 rear) I really like the look of the staggered setup and the car handles great. I'm looking at some new wheels and all season tires and most of the wheels that I like only come in a staggered setup on 18 inch wheels. I'm wondering what you guys think about going to a non-staggered setup on 17 inch or should I go with the 18 inch with the staggered setup? I don't want to upset the way the car handles now. I will be putting the performance tires back on in the summer while living in Europe; there is a lot of rubber left on them.

A non-staggered setup - usually 225/45R17 all around - is the usual for a winter setup. It's also a little less expensive, and much easier to find the tires for.

The fact of the matter is, you always have to accept some loss of performance when going to a winter tire; that loss will probably swamp any difference from the non-staggered setup.

The non-staggered will actually reduce understeer a bit, which could be considered a gain in performance.