Don't forget that the "series" of the tire is actually the aspect ratio and is dependent on the width, so a 215 is going to have less sidewall than a 275 and have a serious impact on how it looks. Wouldn't just depend on aspect ratio to determine what you think looks good.
To say it differently, a 245/45R17 and a 275/40R17 have about the same sidewall height and overall height/diameter, even though one has a smaller aspect ratio.