I'm also running a D-Link DIR-655 Extreme N Wireless Router, love it, works flawlessly, very easy install, even for an old guy like me.
It's set up on the second story of the house in a room that has a lot of ductwork under the floor so I was concerned that this might not be the best location for me but there have been no problems, conplete coverage from the top of the house to the basement. I have also taken my iPod about 100+ feet outside the house before the signal dropped away.
Is the 125' distance a straight line guesstimate? I am wondering if you do need the rangebooster but better safe than sorry as you are going quite a distance.
