I've just seen the Sony J5 on the back of a mail-order catalogue(littlewoods extra) on the Orange Pay as you go network(for those in England) for £130
What cable do you need to connet the J5 to your P.C, and what software is needed to use the in built modem?
To my surprise, this phone is much cheaper than the Z5 (almost half of it). The feel of the J5 is ok and I must say it's pretty thin plus it comes with reasonable big screen. Also, the ringing tone is somewhat similar to Panasonic GD92 - a touch of symphony that determine it's most distinguished feature. Main difference between J5 and Z5 is J5 comes equipped with WAP capabilities.
In short, this is not a bad phone produced by Sony as compared to their previous models. Their innovation is picking up in the market.