I like helping people with their planned PC builds, you're no exception.
- I would go with a different case myself. The 450D is the lowest quality case Corsair has ever made. In that price range you can get a NZXT H440, Phanteks Enthoo Pro, Fractal Design Define R4, CM 690 III, etc...
- I would wait a few more weeks for the release of the Geforce 800 Series. I do believe that they will come out sometime in September.
- I would go with the WD Black instead of blue, a decent amount better.
Everything else seems like a good choice to me. If you wanted to make the build look amazing you could get a white version of one of the cases I mentioned, get some black RAM. Then you would have one sick looking beast.
If you wait until the 800 series comes out, then you could go with a 880 or even 870 and either of those could handle 1440P. I hope I helped, and I hope you have a great day!