Well it's hard without a real budget. If you could afford 200 a week, I'd say you should live bang in the middle of shoreditch, if you could only afford 150 then I'd say bethnal green which is close by but cheaper and if you could only afford 100 I'd say hackney which is close by and even cheaper still, or Bow which is a 5 minute bus journey away and cheaper.
And that's all based on the assumption that you wanted to live in east. I don't know about camden cos I've never lived there.