You could downgrade to their new Even More Plus 500-minute plan for $30 and add @Home for $10/mo, saving you about $15/mo. If you're a AAA member, you can actually knock off an additional 13% off the $30 plan. Texts cost $0.20 each; otherwise, it's $10/mo for unlimited. The best part of this is that it's month-to-month; the downside is that you don't get cheap phones.

Adding a data plan is $30/mo (pretty standard across all providers). The question is whether you will get $30's worth out of it every month--or, are you that desperate to be connected anytime/anywhere. Otherwise, you can pay $10/mo for T-Mobile HotSpot or Boingo if you need wi-fi while away from your home.