290X is not a good choice if you're looking for a cooler build.Intel i5 4670k processor and an Nvidia 780/780ti will run everything on ultra at 1080p for the next year or two. The processor will probably be fine for 5+ years, the video card will have to be replaced in 2-ish, to stay up with modern games on ultra settings. And AMD 290x video card is also a good choice if you have any preference for AMd over Nvidia.
Waiting for the new K haswell chip I would agree with.If you want to overclock you should just wait a month or so until the 'Devil's Canyon' Haswell-k CPUs come out with the new thermal interface material. Intel is saying they can do 5ghz on air cooling.
The 4670k can barely get to 4.2 stable on good motherboards, and at that point it's not worth the trouble over getting the refreshed 4690, for 15 dollars cheaper, running stable at stock on a cheap motherboard, with Turbo freqs up to 3.9.