I use opera mini on dual core 1.2Ghz Android with 4" screen because pages load faster on edge mini than on uncompressed 3g. and mini is very good at saving battery for you, which is very important on Android, unless you have a pocket nuclear reactor. and don't forget crappy internet speeds on AT&T because there are too many iphones. so much for real life usability of expensive smartphone in a developed country.
I'm sorry, but in a few years you won't be able to buy a feature phone. Smartphones will get better battery life, screens etc as costs come down (and the third world gets richer) and technology marches on.