I'm not sure of others' experience, but my car had Hall Pantera wonder wheel seat rails installed by the previous owner. Granted I've only put 1200mi on the car and not moved the seat too much, but when I have, it's moved smoothly.
However, $250 (exchange) to move to the new rails and wheels (or $70 just for 8 wheels) seems like a lot of money ... There's a thread that talks about Wonder Wheels, as well as some DIY wheels (dimensions included), and I think one other vendor's offering folks have tried ...
http://pantera.infopop.cc/eve/...470047075#3470047075 One thought, if your passenger seat still rolls smoothly, is it possible to move the wheels to the driver side?
Good luck!