I normally also would subscribe to the "if you keep waiting for what's next, you'll be waiting forever" mindset, but in this case you're talking about at least 1 phone that has credibly been rumored to launch in 9 days in the Fighter. I said it before in this thread, you'd be stupid not to wait. I had actually decided to wait this time before even the Fighter/S3 were leaked. This current crop of phones just seems like an interim step to me, none of the phones (especially the Nexus) justified their price-point or more importantly the use of a 2-year upgrade.
I was and still am in the same position as the original poster, and was seeking advice the same way. You just have to take the advice from people who already upgraded to a new phone with a grain of salt, as they're going to defend their purchase and justify it to themselves, and that will come across in their "advice" to you. Especially people who bought the Maxx, thinking it's the greatest phone in the world. You hear about the battery and want to believe what they say, then you go into the store to see the phone and realize compared to the Spectrum and Rezound the screen looks horrible. And you look deeper into the specs and see it's basically the same processor as the X2.
Here's the thing with waiting...if you're going to wait, you have to know what you want to wait for. In my case, I wanted the battery of the Maxx in a phone with an HD screen and a bit of a better processor to hopefully help my phone run more smoothly. The Fighter is rumored to be just that phone. Now it makes even more sense to just wait and see if it is. If not, I'll wait until a phone comes around that is.
Upgrading now is dumb, especially because you're already 3-4 months into the lifecycle of these latest phones. And unless I'm wrong, the Nexus and Maxx are still sitting at $300 at the Verizon store.
As for your comment about battery, that's definitely a concern. But the Fighter is rumored to have the same 3300 battery as the Maxx, which even with the better processor and screen enhancements will I'm sure be more than enough. In fact, the biggest knock I've heard on the Nexus is that battery. But if the S3 hits with a 1750 battery I probably won't even consider it, I don't care if it does have wireless charging.