For some reaosn the KS didnt show up on my newegg search but its on there now that I look. Most probably think the JS is the 16mb cache version anyway. Im not really sure why I like the Seagate more. I can see why people would like WD, as both WD and Seagate are good companies, WD has a shorter warranty so thats where I believe they lose out. I have both, the thing I recently discovered is that my new 320gb 7200.10 nips on the heels of my raptor, which impressed me. My IDE 250GB WD is nowhere near that but its also not SATA II and its a year or 2 old. Im sure a new Cavier would be in the same ballpark so I guess in the end its the 5 year warranty that makes me lean to seagate. Im suprised there is no love for the Hitachi or the Samsung, Both have 3 year warrantys and have their own positives.