I'm in a similar situation, and I'm waiting for the nexus and moto x before pulling the trigger. the S6 is a great looking phone, but I prefer closer to stock and am concerned with how inconsistent the s6 seems to be.
some users report amazing battery life, other not so much. I shouldn't have to disable/tweak so many things just to get my phone functioning properly. I'm also concerned about that sealed battery down the road, and even though it's toned down a ton, I'm not a big TW fan (one of my phones is an S4).
the new blue S6 would be my choice, aesthetically it's pretty much perfect, but that's not a big factor for me. and obviously it's not just a good looking phone, if you factor in everything, it's arguably the best phone ever made. that'll depend on what's important to you though. I'm sure you know all about the camera, and if you haven't seen any test shots, definitely Google it and check em out.
if the nexus and moto x disappoint, I'll either revisit the G4 and S6, or just wait til 2016. like u, I'm not in a big rush. my phone work good enough and I don't mind having the extra cash in my pocket!
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