Next question is how much you did to get the Cel to run at 850. If all you had to do was up the FSB, then you may be able to get away with a really cheap board that supports a 133FSB. If you had to adjust the voltage or anything like that, or if you think that it can only barely get to 850, then you would want to get a board that is designed for OCing that would provide more stable power and also alow for voltage adjustments.