Ankit - I would generally goto CNet, PCWorld, Amazon and PCMag - all these sites would have something to say about almost every model.
PC World just published a good guide on buying notebooks. That might help. Quote:
Intel's Core Duo and Core 2 Duo processors have helped notebooks gain ground in the power department. In our tests, notebooks using these dual-core processors performed considerably faster than notebooks using single-core processors, particularly when multitasking.
Some notebooks use AMD's Athlon Turion 64 X2 dual-core processor, which also supports for improved performance. The Turion 64 X2 and the Core 2 Duo both provide 64-bit support, which will become increasingly useful as more 64-bit applications reach the market.
Low-end notebooks offer Intel's Celeron M processor, which is generally not as speedy as the Core Duo processors.
PCWorld recommends a 1.73-GHz Core Duo processor. For everyday work--word processing, spreadsheets, e-mail - you don't need the latest, greatest (read: "most expensive") processor, but thankfully, with the Core Duo, you get strong performance and great battery life.
Full story.