What tires should I buy

As others have said, your choice will be a trade off. You may gain life, but you may loose traction. If there was just one tyre that would do it all well, then it would be easy, but it is not.

In addition to what you find here, I suggest you check out TireRack [tirerack.com] They have a lot of good solid information.

I don’t know were you are or how bad the winters may be there so I will not try to suggest any specific tyres. I will suggest that if you will be driving on snow or ice, then you should consider for WINTER tyres (not snow) for the winter, and regular tyres for the rest of the year.

4 season tyres are not the best choice for any weather conditions. They are a compromise.

Do tell us where you life and fill us in on any local weather conditions we might not be aware of. Then we may be able to provide better advice.