Here's a much better system:
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor ($197.99 @ SuperBiiz)
Motherboard: Gigabyte GA-B150M-DS3H Micro ATX LGA1151 Motherboard ($56.98 @ Newegg)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR4-2133 Memory ($31.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($47.49 @ OutletPC)
Video Card: EVGA GeForce GTX 950 2GB FTW ACX 2.0 Video Card ($119.99 @ Newegg)
Case: Cooler Master N200 MicroATX Mid Tower Case ($32.99 @ Newegg)
Power Supply: Antec TruePower Classic 750W 80+ Gold Certified ATX Power Supply ($59.99 @ Newegg)
Total: $547.42
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-06-30 01:15 EDT-0400
The i5 I picked out is newer and faster than the 4570.
The B150 Gigabyte motherboard has USB 3.0, m.2 support, and a plethora of other features.
DDR4 memory beats out DDR3 memory in every way and is currently exclusive to Skylake CPU's.
The R9 280X you had listed has no price, meaning your build isn't going to be $500. I implemented the GTX 950 in my system, which will perform about on par with an R9 280 (non X version). This does put the build at $50 over budget.
The case is the cooler master N200, and amazing budget case, and one of my favorites.
The power supply is of much higher quality than your EVGA model. The KR and B series of power supplies should be reserved for business PC's, but not used for gaming as they do not have great components, leading to a shorter lifetime for your system. The Antec TruePower is rated as a tier two unit, great for high end gaming PC's. The extra wattage will leave you with enough room to sustain your system through almost any upgrade you make.
Best of luck!
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