Want to replace my Nighthawk X10 router with a longer range wifi router

I have a 3 year old Nighthawk X10 router for my home, barn (300 feet away) and dock (150 feet away).  I have two Netgear extenders in both the barn and dock.  This has worked pretty well for 3 years but want to upgrade.  The X10 router is located in my living room and for the signal to reach the extender in the barn it has to go through 2 walls (wood paneling), aluminum siding and then a window at the barn (where the extender is located).  Signal strength is -30 at the outside of my house and -63 300 feet away inside the window at the barn.  This degradation in signal results in a speed reduction  from 100 mbps to about 20 to 25 mbps at the barn.  I can't run ethernet and I would prefer not to install a point to point from my house to the barn.  As I said, the X10 router does work fine but I would like to upgrade to a router that has a little more power.  Does anyone have experience with and can suggest one of the newer Netgear routers that will have a better signal at 300 feet than my older X10?  Thanks!