Dear Karthick, i dont remember if i posted relevant to this specific topic any how it will be my pleasure to help you out in this regard..
i will recommend you if you can purchase Linksys G series router... the price difference is very short between N series router and G series but whatever you purchase all routers behave the same basically for a regular average level user... just follow these steps to configure for any brand of router with your DSL Connection...
1- Set your computer IP address to obtain Automatically
2- Plug in your DSL wire to ADSL Port of router
3- Connect via your WiFi card to router and let it obtain IP Address from Router
4- Finish and start using
Contact me if you further query or help required