tedster - 12:45 am on Sep 6, 2011 (gmt 0)
I assume your website is a generic TLD, such as .com, .net etc - correct? Normally changing an IP address doesn't impact rankings, however I have no experience with moving to an IP from another country block. I'd say there is a chance it might impact rankings.
Maybe someone else knows more about it than I do. I've never heard of using an IP address from one country for hosting within another country. It may be possible - just that I've never looked into it or done it.