That is my setup prior to this, I have a firewire enclosure, and the hard drive is dying. However the enclosure only supports IDE (no SATA). So I would be spending more for older technology if I would take that route, when I could just bypass all this together if I just installed it in the iMac itself. If you can get it done, I'm sure it is preferred over having to deal with externals. I'm fairly tech smart, and have good experience in taking apart PCs and such, but never Mac. However, I'm sure I can take on this challenge and be successful after reading some of the guides on taking apart the Intel iMac.