If you're into the modern, flashy architecture, there really is no better place to go than Singapore. The area around Marina Bay has so many interesting buildings and structures per square kilometer that it forms almost a critical mass. If they add one more building there, the whole thing will just go BOOM. And it can already blow your mind the way it is.
Here's a photo I took on the very first night, after a long flight, when I was just starting to explore the area.
I was way too late for the blue hour, but the light pollution there is so big, the sky never gets completely dark. (2013-02-07 Marina Bay, Singapore)