Upgrading with SERO

[lemeiux1]

Ok so my little diamond has served me very well and I still love it, but I am thinking about upgrading. Unfortunately I'm a sero user and that means I have VERY limited options on upgrades since I cant have an android phone. So my question is do you think its worth it to upgrade to a touch pro 2 over my diamond? Or can anyone recommend a phone that I will be able to activate on my sero 500?

thanks guys