My be6  has a maximum multiplier of  12  
so an FCPGA  1.2 is the fastest I am aware of in a non Tulatin
If you did the chip mod you could use a tulatin.  which would increase the chances of a good FSB Over clock.
The be6 has fsb settings as 133 x 12 =1596    I believe the be6  goes to 160 fsb
good luck