More questions
1. Have you read the sticky?
2. Do you work in graphic design / 3dcg? Do you game more or do 3dcg more? Rendering 3d, cg, graphic design, games, rendering videos, trans-coding, etc all have different needs.
3. Do you realize $1500-$2000 is a lot of money for a computer? After the first $1000 it makes very very little difference to the game as to whether or not you throw more money at it.
4. Do you plan to run 1 monitor? 2? 3? What resolution? 1920x1080? 1440? QHD? What framerate? 60Hz? 120Hz?
The most effective way to make a computer that lasts a while is to buy a bit of new gear every year. Can you afford to drop 2k on a box every year? Can you afford to drop 1k? Do you understand that even if you drop 5k on a computer right now, in a few years you will be running games below their max graphics?