This is what we do. IF my whole family goes (2 adults and 2 kids) which never happens that way and we are on the Disney dining plan I bring $100 per day.
In Sept its just my DD and I and we have free dining and there for 11 days so Im up in the air about this. I was thinking of bringing $700 because all the food is paid for but we have most of the things they sell and really dont need anything else. My DD will be getting the bday fun card do there is $65 free for her plus she will probally be bringing her own bday $ from the family and that will probally range from $250-$400 so that will be on top of the $700 i bring but I hope to bring home at least $400 of it.
In Dec I was on the DDP and had my 2 girls. so for 3 of us I brought $1300 for 8 days and brought home $800 so it depends on your spending habits.
I personally would do $100 per day IF you are on the DDP. If not $200 per day.
I always tell my girls you can bring how ever much you want PLUS I will give you $100 and once its gone dont ask for any thing else and it pretty much works except this coming Sept trip is my daughters bday so whatever she wants to do we are giong to do it!!!
(sorry for the ramble, I guess I was thinking the same question and it helped me buy dragging out my answer
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OH.... 1 more thing.. I NEVER use a credit card! I only use cash.My kids figured out how to scan the room key and make purchases on my credit card