How much is an iPhone 5 with no upgrade?

Okay so I have a prepaid phone right now because I couldn't afford a plan before. I was wondering how much an iPhone 5 would cost with no upgrade.
I want a 32GB iphone with an AT&T plan. So when I go to the store I want to know the estimate amount of cash I'm spending. Also how much would you guess I would pay each month. I want free talk and txt and whatever data. It has to be a 140 or less. Hat plan would I get? Thank you so much! I'm guessing more than 700 for the phone and the start of the plan.

$749.99

eBay might be your best bet to pick up a nearly new one.

Also, we have a similar plan and pay about $90 per month with data, text, and nationwide calling.