Upgrading a wireless network card

Hi

I have a two year old Dell, an XPS Q740 (from the system info) Intel i7 CPU. Works fine but I've recently upgraded my router to an N standard with dual channels operating at 2.4ghz and 5ghz, so I'd like to improve the the network options for my machine.

Looking at the device manager, it says I'm using an Intel wifi link BGN 1000 which operates at 2.4ghz.

Can anyone suggest what card if any I can install to bring about a speed improvement. Fibre broadband is also due in my area soon so I want to take advantage of this :emotion-1:

Thanks