Elizabeth,
Thanks for your question!
So the most important thing to remember is that prices are always subject to change, so when planning your budget for the trip, use this information as a guideline, not as numbers set in stone. The best way for you to know the exact cost is to go into the Walt Disney World website, log in your travel information, and select each plan to see what they might cost you. On my family's last trip we did this, and discovered that moving from the standard dining plan to the Quick Service plan saved us more money, and better matched how we like to eat on vacation.
But I don't want to leave you empty handed on this response! Here is some more info that might help. First off, let me give you the links to the plans;
Disney Dining Plan OverviewDisney Quick Service Dining PlanDisney Dining Plan (aka, the standard plan)
Disney Deluxe Dining Plan
As to prices, my most recent peek into that came out like this;
Disney Quick Service Dining Plan: $55.00 per night (adult) / $26.00 per night (child, age 3-9)
Disney Dining Plan: $78.01 / $30.51
Disney Deluxe Dining Plan: $119.00 / $47.50
BOTTOM LINE: I would recommend that you first review the plan overviews to see which best matches your dining plans, then you can look at menus to see how these plans work out for you.
Have a Magical Vacation!