check out my gallery, I have a ton, the 355/25-19 is a smaller diameter tire than the 345/30-19
here's some pics of the 345/30-19 on my car:
and here's a photo of it next to the stock wheel/tire:
I think the larger overall diameter balances the car and looks more inline with the front wheel/tire and gap. I didn't want to lower my car because I hate the "nose-high" look of the lowered cars, and after seeing how balanced my car looks now, I don't plan to lower it.