If you are looking for a good drive, I would highly recommend samsung -
www.newegg.com carries them. They run very cool and quiet.
Western Digital drives (and probably maxtor, and other modern 7200RPM) drives can get very hot, good ventilation for cooling is a must. I don't think I would ever run a WD drive without some kind of air flow (case fan or hd cooler).
If I recall, seagate and samsung are two of the coolest and quietest drive makers. Heat kills hard drives. Samsung drives also carry a 3 year warranty.
Without active airflow, my 160GB WD will get almost to hot to touch!