When care more about speed and space than heat and noise you might also want to look at:
http://www.seagate.com/www/en-us/products/laptops/laptop-hdd/Got the 750gig in my PowerMac (running MorphOS) and its just great.
After the 4th or 5th time loading OWB it put that into the SSD-part (and all that is loaded while bootup) and now its just as fast (if not faster) as the 32GB SSD in the MacMini...
