Access Point Upgrade to 802.11n & PC card for Sony VAIO Laptop

I want to upgrade my aging (5-6 years?) 3COM Office Connect (802.11b) cable gateway, which requires frequent rebooting, with a Buffalo Technology Wireless-N Nfiniti Dual Band Gigabit Router & Access Point.

Currently the only wireless device is a Sony VAIO Laptop, model PCG-GRT250P with a wireless connection described as "LAN-Express as IEEE 802.11g minP"
Does this upgrade make sense, and will adding an 802.11n wireless PC card to the Sony VAIO Laptop improve performance?

Thanks for your help.
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PUNKYConnect With a Mentor Commented:
Sure, it will improve the receive and transmitt signal with "n" mode.
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