The base price of a 6-day MYW pass is $208.74/$167.21 (adult/child), tax included, when purchased from Disney in advance.
If you want to park hop, add $37.28 to each ticket regardless of whether it is for an adult or child.
If you want the Magic "Plus" Pack options, add another $47.93 per ticket.
If you want to do both Hopping and Magic Plus, that addon is $85.20 per ticket.
If you want no expiration, add $47.93 to each ticket.
You can only get the dining option if you are booking a package. The cost is $35/night (adult) and $10/night (child) for all members of your party. I believe that they also tax this at 6.5%. The cost then becomes $37.28/$10.65 (adult/child).
So, 6-days, no addons (not even hopping), expiry and meal plan would cost $208.74 + $37.28 = $246.02 (adult) and $167.21 + $10.65 = $177.86 (child). You would also have to stay onsite and pay the rack rate for your room.
For 6-days, hopping, Magic Plus options and no expiry the cost would be $332.28/$292.88. You don't have to stay onsite and you if you do, you could possibly get a room discount.
Is your head hurting yet? Mine sure is!