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I'd suggest looking at pcpartpicker.com. It might be a bit overwhelming, but it will give you a good idea of what parts are compatible with what.
A few thoughts:
1) 4k itself is not a limiting factor. Many older GPUs can drive this resolution, especially if you aren't concerned with 3D rendering (like Solidworks) or playing videogames. Six 4k monitors, however, is definitely a limiting factor. I'd suggest deciding whether you are 100% certain that you want that many monitors. A quick Google search suggests that any given 4k monitor is about $300; six of those will run you $1800, which alone will fund an excellent computer.
2) One GPU (Graphics Processing Unit) might not cut it. I have a GTX 1080 in my computer and it only has 4 video output slots. This card is pretty close to top of the line, ran about $600 when I bought it, and is huge overkill for just trading. I play videogames on it at high frame rates and it does very well in that use case. If you decide that you want six 4k monitors, you will likely need at least 2 GPUs. You don't need top-of-the-line GPUs to drive those monitors; however, you will introduce complexity into your computer by running dual GPUs.
3) Talk to the folks at Ninja and see what they have to say. Software can either be CPU or GPU bound, and knowing which type Ninjatrader 7/8 is will help you decide where to spend the money. My guess is that it's CPU bound, simply based on the fact that there is very little 3D drawing going on.
4) 32 GB of RAM is a TON of RAM. That's the kind of space you'd need if you were 3D modeling an entire car on a computer. How much RAM does Ninja eat when you're using it? My suggestion would be to shoot for 16GB. You'll save a good bit of money and likely never get close to needing all that space. I might be wrong though; again, talk to the Ninja folks about this. One thing to consider is buying fast RAM. Modern memory sticks have speeds in the 3000 MHz range, and it would be silly to buy 32GB at 1000 MHz which just gets stuck in the mud.
5) Motherboards are tough to pick. In general, you will be served fine by an entry to mid-level MOBO. Motherboard comparison shopping only becomes necessary if you want to significantly overclock your processor, want a specific chipset driving everything, or want to run dual GPUs.
So, the limiting factor really comes down to your monitor setup. If you want to shoot for the six monitor setup, I'd look into 2k or even 1080p monitors like another poster mentioned. 4k gets really expensive really quickly. If you decide that you need all the monitors, you'll probably need more than one GPU. This also limits your motherboard selection to those that can support a dual GPU setup. My guess is that you could probably save $1000 to $1500 depending on how top-of-the-line you want to go.
The video card supports up to four monitors, each can be 4K. I currently have two Samsung 34-Inch Curved WQHD Cinema Wide (3440 x 1440) monitord. The display is over the top, I'm very pleased.
I had been trading on a cheap laptop, since I have been using Mac products for years, but NT required a PC.
