I just found out that H2O has updated their plans to what I consider the best prepaid plan out there.
The $40 unlimited calling/texting plan, went from 100mb internet to 500mb. They also throw in $20 worth of international calling at pretty low rates. Add in that there's no tax that other plans have, and you're using the reliable ATT network, and you got yourself a killer deal.
Until now, the 100mb internet data limitation pretty much knocked away anyone that needed even minimal data. This upgrade makes this plan a whole lot more valuable.