basically what i am saying...is that it would be worth going to 15s from your 14s. bigger isnt always better for performance wise. what are you using the car for? daily driver? show stopper? weekend warrior? since you want a comfort ride......you are going to need a sidwall...the bigger the better. 13s would give you the best sidwall but they look like crap. you are going to want the smallest rim possible with the largest sidwall tire for the best comfort ride. performance wise???...this is tricky. the softer the tire...the better grip. the more tread...better grip. the more tread....worse grip while raining. your tire choice is going to have a huge impact over performance. you will have more choices with the 205-50-15 then opposed to your 205-45-16 or whatnot. or even your 195-55-15. ahh...im sickl of typing...there is to much to teach ya. just get your 15s and pick a tire around 300 or less for treadwear. unless you plan on racing the car