In Spain, at least 400 Euro is ok
This may be driven by your bank, but I have twice been able to withdraw 400 Euros over the past 2 days. Once at Salamander (?) Bank ATM and again at a Barclays ATM. So am now set for a while. I did not try a higher amount as I thought 400 was ample.
A nice touch at Barclays Bank ATM in Salamance: They gave me 6 50 euro notes and 5 20 eruo notes. Too often banks give large dedomincations and it is difficult for small stores/cabs/ etc. to make change.