Let me try this again, not sure if I am grasping what you are asking.
802.11n is only the wireless protocol (others are b and g and range from 5.5Mb/s to the mostly theoretical 600Mb/s for N adapters)
10/100/1000 are the wired Ethernet protocols (802.3) and are rated in Mb/sec the last generally referred to as Gigabit Ethernet.
The port on your router that connect to your ISP's modem (WAN port) is generally going to be the same switching speed as the rest of your ports (LAN ports) so lets say 1000Base-T (Gigabit Ethernet).
However, the Ethernet port on your ISP's modem is probably only 10Base-t or 10Mb/s, so right there we have a bottle neck. Your internet service is probably even slower (1.5Mb/s up to 8Mb/s seems typical these days). Actual throughput will vary depending on a plethora of variables.
Any device (laptop etc) connected to the router (by any protocal, wireless or wired) is going to be limited by the slowest connection on the Wide Area Network (WAN port) AND/OR the available service speed provided by the internet service provider.
The only time that faster WiFi speeds (above and beyond the slowest WAN choke point) is when you are transferring data between nodes on the LAN side of the network. SO, examples of this might be playing games between computers on your LAN, copying large files, streaming media from one PC to a Laptop or other wireless enabled device (e.g. television or media center PC).
Choosing 802.11N over its slower counterparts really doesn't have anything to do with accessing the Internet. It's all about maximizing speeds within your LAN.