I gots to think "The Neigborhood" plan by MCI would be your best bet.
My Mom has it and its pretty darn cheap. $50 for local and unlimited long distance service. Includes your telephone line + call wait + caller ID + all long distance 24/7/365.
Call go off a repeater like cell calls so thye are not always the most crisp, but for a flat $50 how can you complain.
Not sure if DSL will work with it tho
