Hi lulylu,
I think post #2 here should help quite a bit 
I would suggest starting your search with a few phone calls along the lines of some of the suggestions in this article to get a sense of which of these you connect with and then pay a visit to the ones that seem to be the most knowledgeable and helpful and have the selection and value you are looking for.
You have some good choices near you.
Phoenix
PS: I think the Ergomotion 400 is a much better value choice for an adjustable bed.