Which Wireless Modem Should I Purchase?

Hello.
I am looking to buy a new Wireless wifi modem.My Area is 1700Sq.ft which I want to cover under wireless signals.
Some of my friends were saying Belkin N150 is good for me but i didn't think it would be sufficient t cover that much large area.my budget is around 2.5k,I am thinking about Belkin N300.
Please recommend some good modems.

Thanks