I would just go in for the extra $15 from $65.
But if you want to go on the cheap side, t-mobile's prepaid phone plans currently has something similar to what you asked for.

$30/month
100 min talk
unlimited text
unlimited data, first 5 gigs are unthrottled.

Maybe you could figure out a way to pay $60 for 10 gigs of unthrottled, or some sort of pay as you go data plan with them.

The article does not mention this at all, but if the moon is shrinking then its rotational period must be getting shorter (angular momentum). There does not seem to be an indication that the period of the moon is decreasing, suggesting its either too small of an effect, not there, or not being looked for.