I just built my system below, love my seagate SATA 80G....Not a lot faster than IDE, but I like it better. And the cables are much thinner, take up a lot less space....equals better air flow. That is my two cents.
yup sounds like a good thing to do or if u dont plan on trying to build a scale model of the universe on ur comp go for a smaller hd i have a 80gb and i never get it above 65gb