These routers you list are extremely new. The c60 only got FCC approval a week or so ago. Unless you want to dig though the massive fcc reports it will be a while there are lots of details about the internal parts used.
In general all routers put out very close to the legal power. A router that uses higher db antenna tends to put out less actual transmitter power but the total of the transmitter and the antenna likely is close to the 30db legal maximum.
This is actually way to generic a answer since all equipment puts out slightly different power levels on the different frequencies it covers so some may be a little closer to the limit than others. You can search the FCC database if you really want.
What it appears the router...