Your advice is a step backward. The drivers for that computer are available and are linked above. adapters are iffy at best. This computer can already run SATA drives in an IDE compatibility mode.
However, as I stated above, doing so may require re-installing Windows. I am not sure if Chris intends to use the larger drive to run Windows or not.
If anything were to be purchased, a PCI based SATA II or III card would make more sense. None of that should be necessary.
SATA is already working in this computer. Just not the larger/newer 1TB drive.
Christopher, Is the BIOS set to allow the OS to configure the hardware? Not sure if that is an option in your BIOS. Could also be labeled PnP aware OS.