My site (wisebread.com) is a blog/magazine with over 7,000 articles and 2 million pageviews a month. We're currently running Drupal 6. We're considering a migration to Wordpress. A migration to Wordpress won't be super easy. We have a lot of customization on a per category and per article basis. We have lots of custom fields and custom content types. We are also nervous about the SEO implications of the migration's effect on URLs and redirects.
What are the top Drupal to Wordpress migration firms? We're specifically interested in firms with lots of technical expertise. Thanks in advance!