The best for multimedia, Sabayon, coz it ships with VLC player
For cool looks, try Dreamlinux, it looks like a Mac OS X
But mine favourite is SUSE, loads of eyecandy, it is very powerful, will automatically mount your Windows partitions, low on system resources and you can enable and disable 3D with a click of a button.
But it doesn't have full multimedia support, but if you can connect it to Internet then you can download the necessary libraries and pacakages from the net. Try downloading VLC player