Is this $500 as a full system? If so, i'd look at something like these:
Intel Coffee Lake Build
PCPartPicker part list:
https://pcpartpicker.com/list/BmjFmq
Price breakdown by merchant: https://pcpartpicker.com/list/BmjFmq/by_merchant/
CPU: Intel - Core i3-8100 3.6GHz Quad-Core Processor ($109.99 @ Amazon)
Motherboard: Gigabyte - B360M DS3H Micro ATX LGA1151 Motherboard ($65.99 @ SuperBiiz)
Memory: G.Skill - Aegis 8GB (2 x 4GB) DDR4-2400 Memory ($75.98 @ Newegg)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($43.90 @ OutletPC)
Video Card: Gigabyte - GeForce GTX 1050 2GB OC Video Card ($134.98 @ Newegg)
Case: Cougar - MX330 ATX Mid Tower Case ($34.99 @ SuperBiiz)
Power Supply: Corsair - CX (2017) 550W 80+ Bronze Certified ATX Power Supply ($32.98 @ Newegg)
Total: $498.81
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-08-30 22:43 EDT-0400
AMD Ryzen Build
PCPartPicker part list:
https://pcpartpicker.com/list/G6VpQZ
Price breakdown by merchant: https://pcpartpicker.com/list/G6VpQZ/by_merchant/
CPU: AMD - Ryzen 5 1400 3.2GHz Quad-Core Processor ($134.12 @ Amazon)
Motherboard: ASRock - AB350M Pro4 Micro ATX AM4 Motherboard ($49.99 @ Newegg)
Memory: Patriot - Viper 4 8GB (2 x 4GB) DDR4-3000 Memory ($80.98 @ Newegg)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($43.90 @ OutletPC)
Video Card: Gigabyte - GeForce GTX 1050 2GB OC Video Card ($134.98 @ Newegg)
Case: Cougar - MX330 ATX Mid Tower Case ($34.99 @ SuperBiiz)
Power Supply: Corsair - CX (2017) 550W 80+ Bronze Certified ATX Power Supply ($32.98 @ Newegg)
Total: $511.94
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-08-30 22:46 EDT-0400
If you can spare a little more budget i'd try squeeze and SSD in for Boot Drive. Hope this helps!