I upgraded to the WD Scorpio Black as soon as I got my MacBook, and can honestly say the 7200 RPM really does make a difference compared to the stock one. Yet there is no increase in noise, vibration, or heat.
Another thing you mentioned was Seagate's 5 year warranty, well WD also offers a 5 year warranty so when it came to choosing over the 7000.3 or Scorpio black, I chose WD because I have good experiences in the past with there products. The only thing I did make sure not to get was one of these HDD with the built in SMS, reason being I have heard in the past that they sometimes can cause kernel panic since they interfere with the Apple's SMS.
Another thing you mentioned was Seagate's 5 year warranty, well WD also offers a 5 year warranty so when it came to choosing over the 7000.3 or Scorpio black, I chose WD because I have good experiences in the past with there products. The only thing I did make sure not to get was one of these HDD with the built in SMS, reason being I have heard in the past that they sometimes can cause kernel panic since they interfere with the Apple's SMS.