Since Blogger (blogspot) isn't an actual hosting company, there's no real way to transfer the site from Blogger to your account with us directly.
However, Blogger has a feature which will allow you to migrate your content via a zipped file.
They have a FAQ entry on how to accomplish it here.
Additionally, as of version 2.2, WordPress supports importing directly from your blogger account:
In your WordPress Admin area (domain.com/wp-admin), go to Manage → Import → Blogger and follow the directions to complete the import.