Under your price HTC Desire 820S is the best smartphone for you. It has large display 5.5 inch with Corning Gorilla Glass 3. This is a dual sim phone. And both sim are 3G supported. It runs on Android v4.4 kitkat OS and 1.7 GHz Octa-core processor. The camera is 13 MP rear camera with LED flash and 8 MP front camera to capature the beautiful pictures. It has 16 GB internal memory with expandable microSD card up to 32 GB and 2 GB RAM. The non removable battery is 2600 mAH capacity. All features are suited for your demands. Desire 820S is released on March 2015.
I would say, the Samsung Galaxy S6 is the best model in Samsung. This is waterproof mobile, this is the best feature. It is built around a 5.1 inch display with Super AMOLED capacitive touchscreen. Galaxy S6 offers a 16 MP real camera with LED flash and 5 MP front camera. It produces clear images under the water. It has 3 GB RAM for store more files. It offers latest lollipop v5.0.2 operating system. It has 2550 mAh battery, and this is non-removable. The internal storage is 32 GB, 64 GB and 124 GB with different price phones.