aakk9999 - 12:13 am on Sep 14, 2013 (gmt 0)
I am presuming you have done basic checks that the host you want to move to will result in your site still being in a good neighbourhood and that the response times from the new host are equal or better than the current host. So that taken care of, then:
If the host is in the same country as the current one, and there are no technical issues during the host move, you will be fine.
If the host is not in the same country, you are not geotargeting via WMT and you have gTLD, then Google may change how it sees your domain being geotargeted - which in some cases may affect the SERPs.