I have a Netgear extender (WN3000RP) right now, and it's only borderline usable in the next building. At my PC that's wired into the router -> modem, I get 17mb down. But in the next building, I'm only getting about 1mb down on a variety of wireless devices. I have the extender mounted up in a window that's facing the other building, which is only about 50' away, and only has 1 wall that the signal is going through. And the devices that are connected are right on the other side of that wall.
The router I'm using is a Netgear WNDR3400v2, which is only about about 15' away from the extender in the window. Speeds coming out of the extender are the same as the speed at the PC/router (my phone connects to the extender and I ran a speed test while right near the extender). The extender just isn't pushing the signal far enough out for my needs.
What other extenders should I be looking at? I'd say that $200 is the max I want to put into this. But closer to $100 would be ideal.