i7, rog board, 8gb ram, 800watt gold psu, 670/680/7970 gpu, 1tb hdd, 240gb ssd, $150 case, OS, etc lol pick ur parts lol
Personally at the moment would get a 3770k, maximus v formula, corsair HX 850, asus 7970, 8gb 1866/2133, wd black 1tb, samsung 500gb ssd, and a noctua nh-d14 will cost about $1800 no OS or peripherals then pick a case etc lol
$2000 is quite alot to spend for just a gaming pc, u can prob half my estimate with a i5 3570k, asrock extreme 4, 670gtx, 750hx psu, 8gb 1600, 1tb, 120gb ssd, CM 212evo but even this is $1200 with no case and OS etc