Pretty much any SATA 2/3 drive can go into your system provided it has the ports to connect to it. Is it possible to shoot an SKU for the Dimension you own? It'd help with narrowing down the board. In fact if you can take a pic of the boards model number, it'd help.
Off the top of my head, you can pick up any desktop grade SATA HDD out there and populate it in your used system. Budget perhaps?