I have a 3-year old iMac C2D with a 320 GB HD and a 1TB Time Capsule hooked up to it. I also have a FireWire 400 ext. case with an old 120GB HD in it. My mac has been feeling a little sluggish and I think it's time to do a fresh install on my mac as it's been ages since I've done a fresh clean install (I upgraded Tiger to Snow Leopard). I recently added an HD HomeRun capture device so I can record High-Def cable with elGato's EyeTV but now I'm going to be filling up my hard drive pretty quick! (a 30-minute show at 1080p is 3GB!) I also want to start using the new App store from Apple but I want a fresh install to build upon. So my question is, should I just replace the ext. HD with a 1.5 TB model, and do a fresh install on the internal HD, or should I install a 1.5 TB HD into the iMac, and move the old (but reformatted 320GB HD) internal drive to the ext. case? If I installed a new 1.5TB drive into the iMac, would I be able to restore from my Time Capsule? I've had my TC for over 2 years and I've never had to use it or back-up from it (knock on wood).