Ok so im starting a new contract (two year one) and i dont know what phone to choose!!!

Nokia 5800 is $25 per month and Id get $50 credit and 300mb data
Nokia 6760 is the same deal as the 5800
Sony ericcson Vivaz is $35 a month and Id get $150 credit and 300mb data
Nokia X6 is $45 a month and id get $250 credit and 300mb data

I get around $130 a month pocket money and dont have a job yet.. So im not sure what phone to get
Well yeah what are your thoughts on the phones and the deals??

Please help, thanks