Looking at what you posted I would set the voltage at 1.5v which is the ceiling for the processor. If its locking up and blue screening that usually means that it isn't getting enough voltage. Once when you get that to be stable. drop it by .125v and then you should reach a stable overclock.
What voltage are you at ? you can go up to 1.45 safely, 1.5 is the max i would go but you can go 1.55 if you have balls and good cooling. Also you have an unlocked multiplier so why not OC the CPU and NB using the multiplier and keep the fsb at 200, might get better stability.
That is a darn good OC, especially on an older board running DDR2 memory. That's a solid OC for our processor even on a newer board for most people. I'd be more than happy with that number if I were in your shoes- if you ever move over to a newer board with faster memory, then it might be worth readdressing. For now I'm impressed with what you squeezed out of it.