Should i buy iPhone 4 again?

I'm currently using an android but I had an iPhone 4 not long ago and sold it because I needed the money. I'm going to keep my android phone but should I buy an iPhone 4 for £120 or maybe save up more for an iPhone 4s? I don't have too much money and I'm really looking forward to iOS 7 just being released yesterday, thanks

IPhone 5S

Definitely the newer the better, so the iPhone 5s is the best. But if you don't want to spend too much money, then iPhone 4 is fine.

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