Buy an iphone 5 or wait til iphone 6 or galaxy s4?

I've owned both before, I've owned an iphone 1 and 3g and also a galaxy s2. I really dislike how my s2 has so many bugs and i'm planning on getting a new phone in the future. Should I buy a used iphone 5, wait for the iphone 6 or galaxy s4?

Iphone 5s is about to come in june/july. No sign of iphone 6 in future till now. And galaxy s4 is also about to launch in april/may. I bet iphone 5s will have almost the same features like iphone 5. I suggest you not to buy iphone 5, you shall wait for the launch of iphone 5s.

Galaxy S4

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