| IMO, 18's look more aggressive than 17's, but it also depends on what wheel we're talking about too. If you do go with 18's, don't go with 35's. I'd would go with 215/40/18. 35's are too thin, provide a harsh ride, and you run a bigger chance of warping your rims.
But, take it from someone who's been riding on 18's for about 2 years. It's gonna kill your acceleration, braking, and gas mileage. I know you said, you didn't care about speed, etc... but trust me, your braking will suffer so plan on upgrading your brakes soon. I'm ready to ditch my 18's and go with some nice 16's. 18's look nice, but it's too much of a compromise. Good luck. | 
lol 
