I would say around the £1250 mark.
We stay in an apartment with a full kitchen. When we get there, we do a full supermarket shop - beer, sun cream, lots of fruit, breakfast stuff, snacks, drinks etc, etc. Costs around $170/200. We stock up as we go along and pay for this on the credit card.
We usually take dollars with us - the rate has been so good so I bought some every month for a good while.
The actual cash we take pays for meals out, icecreams etc. When we are in the resort we charge to the room, but I put the cash to one side as I go along (we are timeshare owners, so get points for charging to the room) and then pay this bill with the said saved cash at the end.
Towards the end of the second week, we usually find we have to go to the atm machine.
Any presents, I usually pay for on the credit card/debit card.
We did spend quite a bit extra this year as the boys stocked up with clothes - VANS, Volcom, Element etc (as they cost $ for £ over there)