I am also switching my theme to the Thesis framework, so look out for falling objects. Let me know as you find things that are broken. I use ServInt.net for hosting, and never have any issues that they can't solve, so I am not expecting any problems.
The Thesis framework is a premium theme and is very popular among the WordPress community. Thesis gives you more control over your blog, while at the same time, freeing you from digging through lines and lines of code just to fix one little thing.
It is set up to improve your site's search engine optimization and provide faster page loads. It offers point-and-click design, font controls, and you have access to awesome support staff as well as a members-only forum.
And then, there's this – my favorite testimonial from DIYthemes.com:
“If God had a WordPress theme, he’d use Thesis.”
Matt Langford on Twitter
That's classic! I'm going to try it out for a while and I'll be letting you know about my experiences with it. If you'd like to try it out, too, you can get it right here through my affiliate link: DIYthemes – Thesis Theme Framework
Update: The move is complete with zero downtime and no issues so far.