Which is the best all purpose cell phone at moderate price?

I understand your problem. Hopefully, within $ 80 you can get a phone with all the features that you are looking for. Cell phones are getting cheaper. A few suggestions to help you can be;

1. You can log into quickr and find sellers of second hand mobile phones within your budget. Mobile phone prices go down once it is resold. People who usually have the habit of changing their cellphones every year sell their old handsets at 30-40% lesser than the market prices.
2. Look through the homeshopping networks in your television programs and buy as per your needs.
3. Usually the cheap, beautiful and strong mobile phones should be available within the budget range that you have mentioned. You can log into studentforum.co.uk and find the relevant answer for your question. For your use this will be quite helpful as you can post a fresh query in their forum.