i think it depends when, if you can get a cheap all inc then you wouldnt need much spending money as £1100 isnt a lot , if you can get cheap flights and price up a diy depending on dates, you might just about do it, but if you want to go in the height of season you might struggle, especially if you opt for sc and dont have much spending money
im pricing up some all incs in olu deniz turkey for oct at the moment which are coming out fairly cheap, ie the alize 4* for a week is £215 for 2 people. olu deniz resort hotel £299, these are decent hotels, you can get much cheaper but i would be careful going too cheap in turkey for an all inc, other areas of turkey might be cheaper, but this is a lovely resort.
good luck hope you get yourself a bargain