HELP needed: Cell phone advice

Ok, nothing terribly serious but i am a tad lost in this matter.

I need to buy a cell phone. Yup, technology. Funny one would think in this the 'less developed' part of the world (Mozambique) one wouldn't need one. BUT, here is the thing, we don't even have a land line. Our internet is via antenna on the roof and all our other communication is via SMS and cell calls. This is true in most of southern Africa because one can choose how much one wants to talk and know in advance what is is going to cost. Even out in the bush cell phones usually get reception and can be a lifesaver.

So, I have been looking for a qwerty, GSM, unlocked, quad-band, touch screen, camera phone.

Oh, i don't have the $500 to buy a new one so wil most likely be at the whim of ebay....and although they all look very slick and helpful but which one is better than the than the other? If you ave any experience or info please comment below!

I appreciate the advice.