Should I upgrade?

The answer is NO! Before I had D90, I wish I have any DSLR just because it has a very big sensor compare to 1/2.5 inch sensor of my H5. But now, when I already have my D90, some one ask me an obvious question: Do you want to upgrade your gears? I’ve seen a lot of great photos taken by Canon EOS 5D Mark II and EF24mm f/1.4L II USM, but I’ve also seen great photos taken by 450D or Nikon D50 and kit lens. So, having great gears does not mean you will produce great photos. It depends on you, and just only you.