This is what I'm thinking. Was the S3 out sometime shortly before the 5? I was looking at the 5 versus some Android phone. IIRC I was looking at these 2 phones also when the 5 came out, and went with the 5 due to size and ease of staying with the same OS (came from a 3Gs).
But I agree with everyone, if the S4 is coming out very soon wait if you can. But if it's a few months, whatever. There's always going to be a new, 'better' phone coming out a few months later, especially in the android market.