You will probably pay more than that for the phones if you get it on contract.

I'm paying $40/mo. for voice and data, 500minutes and unlimited data, on T-Mo. But by adding unlimited calling out with Skype for $3/mo (uses cell phone's # as caller ID), and unlimited "free" texting with Gvoice, I'm basically getting unlimited everything.

Even without the "unlimited" aspect, the $20-$30/mo. savings "on the plan", will make up any difference in discounted price over the first year alone. Let alone what I'd be saving switching from AT&T, with similar minutes.