Regarding N:
You may be thinking to yourself, "Self, I'll just buy all my networking stuff from the same vendor and all will be well."
And for you and only you, things may indeed be well. But then, whenever you have a guest over at the house with their laptop, you may have problems. Or if your next computer has built-in WiFI and it doesn't work, you may need to buy a whole new router again.
Therefore, my advice to you is to stick with "G." You'll be glad a year or two down the road...
-Llama