Welcome to WebmasterWorld Guest from 126.96.36.199
Now that I am getting good organic positions, do I risk losing them by switching servers?
Then follow Matt Cutts instructions for moving your domains across and you'll be fine.
My host did a great job getting everything set up. I would recommend them to anyone. They transferred everything over in the wee hours of the morning, I have to admit I was sleeping! 0 downtime which was very nice and the Googlebot is already sniffing out the new IP.