Need Quick Advice!

HI, I'm thinking to replace my nexus 5 with a fast smartphone that will last me a good amount of time. At first I thought to wait for iphone 7, but the changes are really disappointing. I wonder if I should buy oneplus3 or 6p (both around $430) or buy a budget phone and wait for iphone 7s? The reason I want to buy an Iphone is because next year sept I'm going to USA to study and I heard a lot of people uses Imessage instead of other social media. Please provide all the suggestions asap,...

Need Quick Advice!

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