Budget PC for game design office

We are setting up an office for our game design studio and need to get a couple PCs for it that aren't too expensive, but can still handle some 3D work on at least one of them. We have a 980Ti from a system that is being upgraded so we can use that in a system, but need to get the rest.
Here are a couple possible builds.
http://pcpartpicker.com/user/265lutab/saved/s22tt6
http://pcpartpicker.com/user/265lutab/saved/L8j323

Actually I think we may get two of these.
https://deals.dell.com/productdetail/w3?ref=65_view

The prebuilt pc is not a terrible deal. I am always wary of prebuilt though as I know they cut as many corners as possible so as to increase how much goes into their pocket. Regardless, if you still want to drop in the 980ti, then it wouldn't be possible with the prebuilt without a new psu and I wouldn't trust it too much though as the mobos tend to be pretty cheap. I would go with a Xeon/Z170 build and make sure to include an ssd (which I consider essential for any modern build). Mind you, the xeon will require a dGPU, but one should be fine with the 980ti and the other, you can get a Polaris card if you wait a month, or some cheap something for simple display output if you don't plan on gaming at all. What software are you guys using exactly?

Thanks. On the more powerful PC will be using Unity, Maya, 3DS Max, Zbrush, Substance Painter, Substance Designer, and probably various Adobe programs. We are developing for the HTC Vive so we will also be running games on the Vive.

If your budget is near 1k why don't you just get 1 5820K PC and do virtual machines for the tasks that don't need GPU acceleration, nor very strong CPU performance

Also the PSUs you have there are poor choices, go for this one for both, it's pretty solid for 70 bucks, the NEX series is pretty poor
http://pcpartpicker.com/product/kz7CmG/evga-power-supply-210gq0650

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=454

PCPartPicker part list: http://pcpartpicker.com/list/bngv6X
Price breakdown by merchant: http://pcpartpicker.com/list/bngv6X/by_merchant/

CPU: Intel Core i7-5820K 3.3GHz 6-Core Processor ($369.99 @ SuperBiiz)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($28.99 @ NCIX US)
Motherboard: ASRock X99 Extreme4/3.1 ATX LGA2011-3 Motherboard ($219.99 @ SuperBiiz)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-2133 Memory ($57.88 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($47.49 @ OutletPC)
Case: Fractal Design Define S ATX Mid Tower Case ($69.99 @ Newegg)
Power Supply: EVGA 750W 80+ Gold Certified Semi-Modular ATX Power Supply ($79.99 @ Amazon)
Total: $874.32
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-06-04 21:46 EDT-0400

I am not familiar enough with those programs to know whether they take advantage of cuda, opengl, or both. I would imagine that most of those applications would really like a high core count and good IPC. So a modern xeon would likely be the best way to go. I tossed together a build for you. I imagine that at least some of those programs can sue some sort of gpu acceleration. So, take the gpu as a placeholder for whatever you would pick. nVidia for CUDA and AMD for opengl. I imagine that Polaris 11 (rx 470) would be the best choice for the money, once it drops at least. Other than that, this is a solid build.

http://pcpartpicker.com/list/Y3Yv6X