I'm sorry, I have to ask, but are you just here to troll?
I have that exact same Enlight case gathering dust, it's a horrible, ugly, noisy, cheap, flimsy piece of crap. Aluminium cases aren't just lighter, they're stronger, better built, which means less vibrations which means less noise. And when it comes down to it, most of the mass in a PC isn't the case, it's everything else anyway. And please don't confuse real geeks with CS:S kiddies, it's insulting.
Anyway, rant over. If you want simple, elegant design Lian-Li are your best bet, don't worry about vents, they don't automatically make a case louder just because they're there, they just provide a clear airflow design that way your parts don't overheat and explode because it's using the same air over and over.
Everyone else are too busy doing fancy, elaborate designs that make me
.