Unlucky in Cards
From what I can tell, you have a plethora of cameras. This particular album caught my eye because the pictures were with the NEX-7. I have a NEX-3 (would have a 5 but the 3 fits my hands better… and it’s red….) and absolutely love it. The NEXs do wonderful in low-light, except when it’s as low-light as the photos above. I had a lot of the same effects when I was snapping fireworks on the 4th. You might consider looking into the Fuji X-Pro1, a LOT of potential with some of the same aspects of the NEX-7.
Anyways, from one photographer (and web developer) to another… nice photography.