I'm finally looking to get an SSD for my veteran rig with a EP45-DS3L mobo. It has 6 SATA ports on it, but I'm not sure of the port types. I've read that if I get a M.2 SSD I need a M.2 slot on my mobo. I have no idea what that means, so basically I'm asking for help. What do I need to do in order to have an operational SSD in my system? Also, what would be my best choice to go for (thinking 120gb atm).