I found a site called Small Net Builder that runs benchmarks on a variety of equipment. One of the tests they run is for wireless routers. They use Ixia Chariot to test end to end performance between a wireless client and a end node connected over Ethernet. This is the same testing method that we have used for years.
The following chart shows what the top 4 802.11N consumer routers on the market can do. These are routers that cost upwards of $200 and are for indoor use.