DMC,
Mine is a Dell Inspiron 2200 which I purchased in Jan.. Don't know how that compares to your model, but so far I am not having a problem with it. I got $150 dollar rebate (mail-in and took about 8 wks to get) and I paid about 60 for my router. I went to Office Depot, and they offered a $15 rebate on it (again mail-in).
You shouldn't have a problem getting a connection between rooms. My desktop is in my living room and usually I keep my laptop in the same area. But my home is small and I think I'd be able to go all over my house no problem.
TIS
Edit: I just noticed you paid way more than I did. You must have a deluxe model.