Synology Diskstation DS114
This is definitely a NAS that benefits from being a diskless model, giving you great performance at a budget-friendly price. You get two bays in this one, which are designed for 3.5 inch drives but include 2.5 inch holders so you can use smaller disk drives as well. It supports both hard disk drives and solid state drives, making it ideal for just about any computer setup. It includes 512MB of DDR3 RAM, which is perfect for a NAS, and has a dual-core 800MHz processor to ensure fast and efficient data access whether you are reading from or writing to the drives in this model. While additional USB ports would be a welcome addition, this one has a single USB 2.0 port and one USB 3.0 port, which is decent but certainly not amazing. It also has a RJ-45 LAN port so you have a fast network connection.