I have out grown my current web host and have a PR 6 and rank in the top 10 for almost all my keywords, I'm curious if I move my website to a new host will this have any affect on my rankings or being indexed?
No effect whatsoever if done right. Scroll to the bottom to 'similar threads' for a few on the topics. It's been discussed in-depth here a few times. 'Changing host' in the search will throw up at least a dozen too.