you can pay as much or as little as you like to be honest,you can eat 3 courses,an wine for about 30 to 40e,or you can pay as little as 20e to eat,its upto you,also you could visit the gyros shops an only pay 3 or 4 e,sids has a lot of variety an is generally good for your budget,even with the pound struggling against the euro,prices are about as good as you can get on the island.
other resorts are generally pricier,but thats upto you....