If you roll with Sprint, they've just started offering a deal that you might want to look into. According to Boy Genius the "Any Mobile, Anytime" plan will offer unlimited minutes to any US mobile for just $69.99/month. That comes in addition to unlimited data, SMS, MMS, Sprint TV, and GPS Navigation.
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The only thing that isn't unlimited with this plan is land-line calling. You only get 450 minutes of that. I doubt that will be an issue for most folks these days (land-lines are so last century) but if it is, the "Simply Everything" plan is only $30 more. Say what you will about Sprint as a carrier, they offer some of the best deals in the market right now. Check out their website here for more details.