I don't mind spending a bit for a low end commercial solution, as long as I'll spend less than, say, $800, and won't get cancer from sitting next to one for a long period of time :)
It's a rental and I'd rather have the equipment. I've lived in places where running a wire isn't really an option. I've done it myself before too, but that isn't even tenable. Also, I'd have to be pretty damn sure that I'm getting what I want for that money.
What cdr said. It's kind of difficult to tell what the constraints are - how big is the distance, is it your home or an office etc. We use ethernet-over-power-into-multilpe-wifi in my house and it works.