Calling Wi Fi Guru's - Advice?

[Elspode]

I've got a standard issue Linksys wireless router (G). I've located it in my basement, under the first floor, at the end of house where our office is located on the second floor. Reception and performance is just fine at this end of the house, but falls off pretty drastically at the other end. I've added the high gain rabbit ears on a remote stand to the rig.

What I think I need is a repeater, if my limited research is correct. Mounted on the second floor, at about the halfway point between the West and East end of the dwelling. Can anyone recommend a particular, compatible unit, preferably affordable and tidy? Or, alternatively, is there another approach I can take that uses my existing router signal and makes it more usable at the more remote parts of my home?