The rumored specs of the Nexus 5 still would make me choose it over all the ones you mentioned even if they were all the same price. GN3? No way. Hate Samsung. HTC One Max? No thank you. I already have a Nexus 7, a 6" HTC Phone is not something I would need. And one handed phone use wouldn't be good. LG G2? Probably the only one I would even remotely consider. But I hate LG's skin. So no thank you.
I feel the same way. If I wanted one of those other phones, I'd already have one of them. I'm not interested in the Nexus because of its price: I prefer the Nexus experience, as long as there are no glaring hardware issues.