Even the cheapest SSD will max out the SATA ports you have so there is no reason for you to get a premium drive. I also like the Crucial MX500 recommendation but any SATA SSD will do.
You need a drive in the 2.5" form factor (small plastic brick) . Your system cannot support the M.2 type drive (small exposed card the shape of a stick of gum).
You will also need a new SATA cable. They don't come with the drive.
EXAMPLE:
https://www.amazon.com/Monoprice-18...ATA+cable&qid=1565964267&s=electronics&sr=1-5
Get as big as you can. Transferring the whole system to the new single drive will make set up easier for you to manage.
Adding even a single spinning disk to the system slows the startup time.