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We'll need more detail. Are you talking about moving between companies as an employee, or moving a proprietorship, or moving a corporation?
Where are you located now, before the move?
I was moved to the US by this outfit: http://www.qmm.com/home.htm
They seemed pretty good, however this was an expense-paid corporate transfer and was doubtless far from cheap. If you're paying out of your own pocket there are probably less high-end movers out there.
I've been working in the States on a TN for several years, and am planning to move back to Canada in a few months. Are furniture and other possessions subject to tax when I move back? Will I have to prove that items had been previously acquired in Canada?