Hi,
I specialize in migrations from one product to another, actually, and would love to work with you on this project.
I've migrated to WP from a number of apps, and have migrated data from billing systems quite a few times.
If you'll look at my profile (click the link directly, don't go by what they show in this specific bid), you'll see 100% project completion, 100% positive (5 star) feedback, and a link to my own site where I've done the same for better than 10 years now. Your project will be completed with the same diligence and persistance. Your task will be completed within the advertised period of time, and be given everything needed to be done right.
I look forward to hearing from you and working with you on this project.
Tom Whiting