i would be worried about the HEAT with the 7200... and in most environments (for an average user) there is no difference in speed/performance... i mean, if your using for MS Office, Email, Internet, etc THEN IT'S THE SAME... if you're in a NETWORK Environment where you "share" the drive, then maybe consider the 7200
AT LEAST THAT'S WHAT IS THINK!!! I mean, can you really count nano-seconds in your head... not really!!!
I have upgraded all of my laptops from the 5400 RPM drives they shipped with to a 7200. And everytime the system is more responsive, boots faster and loads apps quicker. I also have to add that there was no difference in temperature. There is no reason to worry... and I'm not sure how you can even say that when you have no experience with a 7200 RPM drive.