I am not sure if it is worth it, but you should also be able to get a xeon x3380, which is like a Q9650 but with +.5 core multi, and is E0.
Also, a question that I have been curious about for a while...which, in general (unlocked multi disregarded) should overclock better? A high end E0, such as Q9650, x3370, or x3380, or the older stepping extremes, such as the QX9650 and QX9770? (I forget what stepping they were)