"Sexy" is in the eye of the beholder.
So, are you using a mATX or full size ATX motherboard?
Also, what are the specs for the system in question?
either ATX or mATX is fine. I'm using a mATX board jut because I'm on a budget.
As for specs, 8gb RAM, Powercolor 7850, i5 3330, 500gb Caviar blue hdd, xfx 550w psu, gigabyte mATX B75 motherboard.