I bought my used set complete, so beggars can't be choosers lol. Finding a decent used set, no curb damage, with even + deep remaining tread in a good size is a challenge.
Also, while it is my "winter" set, I'm still only going to be on snow <10% of the time. I need the DOT snow rating for "traction tires required" areas. The 225 vs. 215 i wouldn't consider that big of difference anyways but I definitely wouldn't upsize. Back east I'm sure sees a lot more snow than where I'm at
When it comes time to replace I'll consider the 215/65 setup