Lots of good advice. I 2nd the M.2 ssd. I built my new computer after Thanksgiving '15, picked up lots black friday deals. Asus Z170A MB, Samsung 950 Pro M.2, and a Samsung 850 Evo 500gb, Intel Skylake I5 6500, and 32gb GSkill DDR4 memory, Nvidia EVGA GTX970.
Again, I highly recommend the M.2 they are screaming fast, you dont realize how fast they are until you own and use it for a while, then go back to an SSD. Similar feeling when you went from a mechanical HD to an SSD.
I've built several computers and I'm an ASUS fan. I've always had good luck with them, and of course you cant go wrong with Intel processors. Spec out a system on Newegg.
If you need to save some money then look at Asus MB and AMD processors excellent bang for your buck.
Video cards look at Nvidia GTX960 or 970 series, and the AMD Radeon R9 380, 380x, 390. They are in the 200-300 dollar range. And you cant go wrong with either, the AMD tend to draw more power than the Nvidia. You would need to make sure you have a 500-550watt power supply. Since you dont game you shouldnt need more than that.
Depending on the age of your current system you might need to check in to a new power supply, the as you might not have enough of the right connectors. My Asus has an 8 pin cpu connector, and my old supply only had a 6pin so I had to get a new supply.
Good luck.