Laptop WiFi b/g or b/g/n

I have a Draytek 2710n modem/router and I'm looking for a mid-price laptop for wireless connection.

I'll want to share files across the desktop PC (wired) and the laptop and use the laptop for internet.
Will I get a real advantage if I aim for a b/g/n laptop or won't I notice the difference?
Thee still seem to be many laptops with just b/g - even from makes like Dell and Sony.
Insisting on 'n' is quite restrictive to laptop choice because I also want a good quality display.
I'd be very grateful for help on this.
Thank you