Hi,
Sony Ericsson S500 is a mid-range slider of slim design and daring exterior, which offers very standard, not to say unoriginal, functionality. Available for around 225 Euro, the S500 is easily challenged by a number of Sony Ericsson models offering respectable functions in this price range. Which way you will go is just up to you.
The S500 will easily appeal to the senses, but the Walkman W580 could well be the more reasonable option. FM radio, fitness application, superior headset, and a 512-MB memory card are enough features to make the Walkman phone worth the additional investment.