Hi here is idea of ideal build for 700$ that include monitor:
CPU:
AMD - Ryzen 5 1400 3.2GHz Quad-Core Processor
$165.87 OutletPC
Motherboard:
ASRock - AB350M-HDV Micro ATX AM4 Motherboard
$69.49 SuperBiiz
Memory:
Crucial - 8GB (1 x 8GB) DDR4-2133 Memory
$54.77 OutletPC
Hdd:
Seagate Barracuda ES 1TB 3.5" 7200RPM Internal Hard Drive
$39.99 Amazon
Video Card:
MSI - GeForce GTX 1060 6GB 6GB GT OCV1 Video Card
$224.98 Newegg
Case:
Deepcool - TESSERACT BF ATX Mid Tower Case
$34.98 Newegg
Power Supply:
EVGA - 500W 80+ Bronze Certified ATX Power Supply
$36.88 OutletPC
Monitor:
Acer - G226HQLBbd 21.5" 1920x1080 60Hz Monitor
$79.99 Amazon