Depending on your budget, you might want to take a look at some used workstations on eBay. I got a fantastic deal for $1800 on a dual CPU, 2.9Ghz, 8 core-per-CPU workstation with a RAID 0 SSD array and Quadro graphics card, the thing is built like a tank.
Alternatively take a look at AMD's Threadripper CPUs for possible better bang-for-your-buck vs. Intel. Whatever you get, the increased competition between AMD and Intel will be good for you.
- Oshyan