Just a couple of years ago, the iPhone 5s was at the top of the iPhone fleet. Unless Apple returns to a smaller screen size in the future, the iPhone 5s will be the last iPhone to sport a 4-inch screen.
As far as pricing is concerned, the supply chain source says that the 8GB Apple iPhone 5s will be priced slightly to the north of what the company charged for the 16GB Apple iPhone 5c. The 8GB iPhone 5s will keep all of the specs of the original device (not including native storage, of course). It is powered by an A7 chipset with the M7 motion coprocessor inside. The 16GB iPhone 5s is currently priced in India at the equivalent of $498 USD, so we should expect the price of the 8GB model to come in lower.
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