Need Advice for Nas build

Here are my initial specs to build my NAS. I do not really have a budget but I would like to keep it reasonably priced. The goal is to run a NAS and media plex server for my home only with direct play (4k), I would like to run sonar, radarr, jackett, torrent box, and maybe other services. Is this a good build or should I change anything around? When I purchase storage should I go with Sata or SAS? Are used drives worth using?

I am going with Unraid if that helps.

|motherboard| - X10SLM±F Motherboard microATX Socket H3 (LGA 1150) Testing with warranty|$115|

|CPU|Intel Xeon E3-1225 v3 3.2 GHz LGA1150 4 cores 4 T SR1KX CPU Processor 8 MB |$62.79|

|Ram| NEMIX RAM 16GB Replacement for Samsung M393A2G40DBO-CPB DDR4-2133 ECC RDIMM 2Rx4 |$ 47.99|

|Cache drive| TEAMGROUP GX1 960GB 3D NAND TLC 2.5 Inch SATA III Internal Solid State Drive SSD (Read Speed up to 530 MB/s) Compatible with Laptop & PC Desktop T253X1960G0C101 | $82.99 |

|Case|Fractal Design Node 804 No Power Supply MicroATX Cube Case FD-CA-NODE-804-BL, Black | $109.99 |

|PSU| EVGA 500 BA, 80+ BRONZE 500W, 3 Year Warranty, Power Supply 100-BA-0500-K1 | $49.99 |

|CPU Cooler|ARCTIC Alpine 12 LP - CPU Cooler for Intel Sockets 115x and 1200, with 92 mm PWM Fan, Low Profile, up to 75 W Cooling Power, with Pre-Applied MX-2 Thermal Compound, Easy Installation | $9.99 |

||total| $478.74 |