Looking for a new PC for Gaming, 3D and Video Rendering

For the SSD, I recommend the Samsung 850 EVO series. The 4790K is 40.-4.4 GHz stock, so no need to overclock.

850 EVO: http://www.flipkart.com/samsung-850-evo-120-gb-ssd-internal-hard-drive-mz-75e120/p/itme33twghufrcst?pid=IHDE33TRMDMJ9BXG&srno=b_2&ref=1a1de92f-efd6-47f4-a2ac-b620cd952f8c

I'd recommend a Z97 MB like this, because Z87 may not be compatible with the newer CPUs without a BIOS update: http://www.flipkart.com/gigabyte-ga-z97-d3h-motherboard/p/itmdysm6ygt9zyww?pid=MBDDYSM6GFNDNBRW&srno=b_6&ref=5baf0a8a-b47c-4758-a5a9-4c34b0e85f09

I'll need to go now, I'll be back in about an hour.

Z97 board for sure. Also, I recommend a Seasonic PSU instead of the Coolermaster, if you can find one there.

i believe the Asrock board is much cheaper? if it is much cheaper thn go with Asrock, get the Extreme 4 if possible, The "GAMING" board is just a marketing gimmick, it does not really improve your system's overall performances, if you have plenty of money to spare then go for the MSI board cuz it looks really nice

What specific software do you use for 3D modeling, and what specific export renderers do you use?

The R9 290 is not widely supported for GPU accelerated render/ray-tracing engines, so this part of the build may need to be revised.

Not very much. Maybe 4.6? The stock OC is already pretty good, and that kind of limits the percent/ gains you'll get.

V-ray's GPU accelerated rendering option has poor AMD GPU performance and support. Stick with nvidia CUDA cards if you want to use V-RAY's GPU render mode.

AutoCAD and 3DSMAX both use DirectX viewports, and both of them favor Nvidia's dirextX implementation and optimizations for performance.

Photoshop doesn't care, anything better than an R7 250 or GTX650 will have the same performance (it does use the GPU, but performance scaling stops beyond low end GPUs). Coral Draw doesn't have any GPU API requirements listed at all for system requirements, so we can assume that it scales predominantly with CPU performance, much like Photoshop will.

The After Effects preview engine can be accelerated on either AMD or Nvidia hardware pretty well, however, the Ray-Tracing engine is only functional on Nvidia Kepler and Fermi architecture GPUs, no Maxwell, no AMD cards here. If you use the Raytracing engine in After Effects you're going to want to select a GTX400-700 series GPU (excluding the 750/ti series) or a GF or GK core quadro card.
Alternatively, since long-term support for the AE ray-tracing engine is being dropped, and replaced with the C4D raytracing plugin, (which is entirely CPU based), you may not need to worry much about what GPU you intend to use in AE.

Maya uses an advanced openGL viewport that really only works correctly on workstation GPUs (FirePro or Quadro). It favors FirePro but works good with either. If you intend to use this application for any advanced projects you'll need a workstation GPU.

Sketchup uses a basic openGL viewport that is supported just fine on all mainstream gaming and workstation GPU's, anything will work fine there.

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With all that said, the most versatile GPU for your intended use would be a Quadro K4200. It's not a good value GPU for any one of your specific tanks, but it's the only one I am aware of that can reasonably fulfill ALL of your requirements (including gaming) with good performance and support without costing thousands of dollars.

The K4200 will provide excellent viewport performance in 3DSMAX, AutoCAD, and Maya. Reasonable GPU accelerated performance in v-ray-RT GPU mode, Excellent acceleration of manipulations in Photoshop. Excellent preview and export render performance in after effects. Excellent performance and support in the After Effects ray tracing engine. In gaming it will be comparable in performance/visual quality to a GTX660 3GB edition.

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Whether you overclock or not, I do not advise using the stock cooler for an i7-4790K. The Hyper 212 EVO is popular but boring (they are everywhere). If you don't intend to overclock a 90mm unit will be easier to install and put less strain on the motherboard HSF mounting. SilverStone AR02 or Noctua NH-D9L would be nice.

If you want to be able to use the ray tracing engine in After Effects, go with the GTX780, if not, the R9 290 is fine.

The Maya viewport won't work right on either.

The Hyper 212 is fine.

The 780TI is faster than the 290 at gaming for now at 1080p. You can also turn it into a K600 by resistor mossing, if you are so inclined.

Sorry. I meant resistor modding. I guess I was trying to type too fast. (and it's a K6000 not a K600 too). Basically, you can remove a resistor from the PCB, put another one in a different place, and load a Quadro BIOS, which would unlock the full Double Precision potential of the card, for accelerating 3D applications. Yo would still have the same VRAM though, and it will void your warranty. You don't have to do it.

The double precision math capabilities of the K6000 are not used in 3D applications.

The only difference between GeForce and Quadro in CAD and 3D design, is the driver, and its support and optimization of advanced openGL features used in some viewports, like Maya, and SolidWorks.

I'm too absent minded to differentiate that stuff . All that really matters is you take out a resistor, put another in, and BOOM, your stuff loads twice as fast. And, because it's now a Quadro in name, you'd be able to use the larger feature set of the Quadro.