I came up with a neat little build you can try.
CPU:
http://www.newegg.com/Product/Product.aspx?Item=9SIA4GH48R9677&ignorebbr=1 X2
MOBO:
http://www.newegg.com/Product/Product.aspx?Item=9SIAAY94DY2970&ignorebbr=1RAM:
http://www.newegg.com/Product/Product.aspx?Item=9SIA5752CV1924&ignorebbr=1GPU:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814133634&ignorebbr=1PSU:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438027&ignorebbr=1SSD:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820147372&ignorebbr=1HDD:
http://www.newegg.com/Product/Product.aspx?Item=9SIAAEE3VU8144&ignorebbr=1CASE:
http://www.newegg.com/Product/Product.aspx?Item=9SIA1UH4R96252&ignorebbr=1CPU COOLER:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103064&ignorebbr=1 X2
DVD DRIVE:
http://www.newegg.com/Product/Product.aspx?Item=N82E16827151290&ignorebbr=1A bit of explenation behind my logic.
The processors are older tech Xeons, but with 16 cores and 32 threads, you can't go wrong. Make sure your OS can support that.
This would be a two CPU setup, but with such cheap CPUs, the expense of the board really doesn't matter. You can go for a non refurb CPU (Whatever, it will work) but it will be twice the money, and going for a higher base clock is more expensive (This CPU can boost to 3Ghz) Your only disadvantage is that the single core performance won't be the best, but not bad. Hyperthreading tasks should work great, so for workstation/CAD/video editing tasks this is great. Gaming normally takes advantage of multiple cores (You said you played GTAV)
I included a GTX 1060, but you can go for a 970, 1070, or even higher, or even do SLI (I think.) I run a 970, and it's pretty good.
It has a 250GB SSD (You can go for a 500GB one or even an NVME PCI-E one) and a 1TB HDD (Of course you can go for 2TB) This is all about what you want and how much you can pay.
This is intended to be something you can add stuff to do if you want.
If you use speakers, you will need a soundcard. Shouldn't be hard to find a cheap one, and you can grab a USB3 or USB3.1 card if you want, but I never use it, so get what you want.
The PSU has support for two CPUs, and it's from a reliable company (EVGA tends to make good PSUs) and it should be fine for this setup. If you want another GPU, them maybe go for something higher MAYBE?
The RAM is something I picked, be careful with RAM because even though it never happened to me, RAM especially on Intel systems can just decide to not work.
You already have a computer with what OS you want, so you can migrate the drive over, or even install it as a third drive. I would NOT use Samsung's SSD migrator. Use Marcium Reflect or similar program. Samsung's migrator DELETES your HDD's items instead of cloning it over. This means if your computer crashes or dies through the migration progress, RIP you.
I added a DVD drive, I use them, you might not, you might be even able to grab one from your current computer.
For hyperthreaded tasks and gaming, this is a BANG for your buck. It's only weakspot is for single thread only tasks (Sadly some programs can't parallelize yet. grumble grumble)
You can add more RAM, it supports a whole load, you can swap out the case for something else if you hate the look of that one, but make sure it supports E-ATX (E-ATX is E-ATX, if it doesn't say it supports E-ATX, move along)