Uhh - You have to focus on specs a little!! :-)
I agree though, that once you pass a certain minimum spec, it makes little to no visual difference. It's knowing what those minimums should be that is the key. You don't want to give her something that she find's the flaw in. Once she see's where the flaw is, her eye will always see it, it will even appear to grow to her!! Trust me on that one - I've seen it before...
2007 Z4 3.0si