I need to actually sit down and write this up, but here is what happened:

1) Disabled the Actiontec M142(something)'s wireless signal
2) Put my old WRT54GSv2 on the network
3) Installed DD-WRT v23 sp2 on the WRT54GSv2
4) Boosted the signal
5) Attached two 125% sized Windsurfer Parabolic Reflectors to the WRT54GSv2 (Sarah helped me to print/make them)
6) Replaced Sarah's WUSB54GS with a 6dbi gain antenna attached to her internal ZyXel 302 (the signal is more consistent, now)