B has better range then G...

I've gotten a block out of B, but only a building with G, wireless networks drop to B if the G signal isn't high enough, in addition, most wireless specs, the receive sensitivity is much higher for B then G, lastly, the power output is higher for B.

But as for N access points, I still go with the router, turn off the DHCP server, and any NAT features and you have an access point.

Some Belkin (shudders at suggesting this brand though) routers have an option in the internal web server to turn it into a Access Point...

Ignore the WAN or Internet port on the router, plug your network into one of the "PC" ports.

The main advantage of doing it this way, and the reason I do, is because then you also end up with 3 more ports as a switch in the AP location.

Kevin