I'd say the only certain board for "cheaper" is the UD3R/P.
Anything less & you are definitely in for a big gamble, as a truely stable 471 FSB quad is NOT a walk in the park for the majority of mobos.
I would not count on that w/ anything less, & even with the UD3R/P you might need to spend a good bit of time tweaking VTT/NB voltages + GTLs to make it stably happen.