If it's running good, leave it there. Try going up on the Mhz and see what your stability is like, if it's not stable, go up a little more on the voltage. Also, take you memory up a step to and see what happens.
You've got a good overclock going for you. Now it's time to play and milk a little more speed out of it.
What are you temps like at your current speed? What heatsink do you have on that 800?