Here is my list of top 5 affordable mobiles which are economic to buy plus they will fill your flagship requirements quite easily. lets start from the number 5, to number 1, you will see the images and specs.
5. asus zen phone
4. lenovo vibe x2
3. Huawei honor 4X
2. one plus 2
please share what do you think is most affordable and high spec mobile for you.