Going in a different direction here:

Buy a stable SSD with your budget to host your OS. Then call around to computer repair places, or E-Waste recycling joints, and ask if they have any old HDD drives laying around that can be recycled to use. Use these older HDDs to store your media and things that can be replaced. You may even get lucky enough to have a few larger HDDs where you can make a backup of your SATA HDD over USB every so often.