OP wants a non-smartphone.........sounds like a [smart] plan
i went from an android phone to a samsung C3050 which has to be the best of the non-smartphones. it costs all of £25, battery lasts a week and you can make calls and send texts on it. also it looks pretty nice (much nicer than all the other ones at this end), it is small, got a basic but clear colour screen, light weight and it is solidly built. after 6ish months of owenership it has taken loads of abuse, been dropped, chewed (by 1 year old teething baby), dunked in a few puddles and so on and it is still fine. the only damage is a small crack on the screen after a flying leap onto some rocks and the actual body is pretty resistant to scratches.
so to sum up the Samsung C3050, is not only one of the cheapest but best non-smartphones imo
if you want to spend more then you may as well get a smart phone or android phone