Those 7k200 Travelstars are a gem. I just upgraded from a 80GB 5400rpm to the same 200GB 7200rpm drive. (Extracted from an external drive on sale this week at Best Buy for $119.99, but that's another story.)
Out of curiosity, I grabbed the data sheets from both from HGST. The units are Watts, average.
Code:
Model 7K200 5K250
Startup 5.5 5.0
Seek 2.6 2.2
Read/Write 2.3 1.8
Performance idle 2.0 1.7
Active idle 1.0 0.8
Low power idle 0.8 0.55
Standby 0.25 0.2
Sleep 0.2 0.1
The 7200rpm drive does draw slightly more power than the 5400rpm. The difference is about 10% to 30% more, but 0.5W is really negligible in the big picture. My T60 on battery idling with power savings turned up to the max still consumes 11W.