5400 rpm vs 7200 rpm hard drive for laptop

I am planning to buy a laptop. How much speed difference will it make if I go for a 7200 rpm hdd (solid state is still a dream object for me). What about the battery cost of 7200 rpm hdd. Heat generation ?  noise ? my desktop hdd was like a monster crawling.

New Google Search

Check out new Google search engine code-name caffeine
http://www2.sandbox.google.com/

Way faster than Bing shing ping ;-)


It looks a new search war is brewing just there
will talk about it later ...