Wirelss card upgrade

[#1]

At present  I have a G wireless card. Would I get any improvement in service with one of the newer N cards.
I don't generally have any problems and my speed is about 12m/s.
Thanks

[#2]

Wireless g is likely to be faster than your 12mb/s so you are unlikely to see any difference with wireless n, it'll only make the comms with the router faster and this isn't usually the slowest part of the network

[#3]

Thanks for the info.