I'm still holding off upgrading my Verizon Android out of protest until they offer the family share plan for internet access. I refuse to pay more for my phones to have internet access than I pay for home internet from AT&T. I think my highest data usage has been around 150mb in one month. Typically, I'm far under 100mb. That may rise slightly since I now have a Kindle, but since Christmas it hasn't been noticeable.
One $30 plan shared between my wife and I would suffice. She has a semi-smart LG phone and seldom uses internet access. She wants an Android. Hers is the $9.95 plan right now. My Android is $20. Rumors vary as to how Big V's shared plans would work, but competitive pressures should prevail. Sprint is selling family data plans for $30/2GB. Rumors talk about a higher Verizon price, like $50 for a family share. If that is their game (and no one else in town has decent cell coverage) I will just root the phones and work from wi-fi. I've wanted to do that anyway. The problem is that Verizon requires a data plan for a smartphone or they won't activate it. The alternative is a rooted brick that can't make phone calls, but does wireless and an old fashioned flip phone on your hip.