Samsung are pretty good, just reliable stylish phones. D900 is pretty darn swish but it seems you are after a whole multimedia thing so maybe the nokia N series is worth a look?
I voted Nano, cos 8gb is enough to have quite a bit of music on it so you wont get bored. Plus its nice, slim and small so your pocket isnt all bulgy. Im upgrading from a 2gb nono to an 80gb Video though