A USB keyboard is cheaper and I really like the keyboards that also works as a stand for the tablet.
Concerning the tablet Zenithink would be a good choice. It should come in at the low end of your budget and it is good a good quality tablet with Android 4.x.
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Try to have a look at the latest Zenithink:Zenithink
You should be able to get this one safely within your budget and with ndroid 4.1
The processor is 1.5GHz and you can ask for 16GB memory.
Good luck with your search.
You can find a nice online maual here: Android Manual, Android User Guide
You need to use a file manager to access and delete files unless they are associated to a program and for extra memory your tablet most likely supports Micro SD cards.
Hmm i guess you don't get any replies because it is a very strange problem. From what you are telling it sounds like your internal memory is corrupted. it could be you have a virus so you might want to run a virus check like AVG.
Congrats from Africa, Android has done more to increase internet access than any other OS here.
It will be exiting to see what the next 4 years will bring. With the speed of innovation we I would be surprised if tablets have not taken over PC's 4 years from now as the main computer interface...
Hmmm that sounds a bit strange. If you mean that the language of the tablet is Chinese then you have to change langauge.
You can find a guide for changing language here: http://it-depot.net/pages/AndroidUserGuide#TOR333
Almost all the tablet out there can meet your requirements (or at least claim to meet you requirements - I don’t know a tablet with a good battery from China or for that matter from anywhere in the world :))
The real differentiator is the need for built-in 3G. This will add cost but is...
You forgot to say that you are the lucky owner of a good sense of humor :)
Never heard about your new toy but it sounds like a decent tablet.
When you get familiar to it you will hopefully find that it is very convenient when you are on the move. A tablet is in my experience not a replacement...