Whether you ferry it or disassemble and stuff it into a container is not as important as a pre-purchase inspection (PPI). I have bought two aircraft from the USA, and for both I went there to inspect and close the deal subject to the PPI.
There is more than enough anecdotal evidence of buyers shelling out big dollars when they find out their new aircraft is not in as good a condition as reported. The cost of travelling overseas to wherever the aircraft is being sold to witness the PPI and check the log books is small change compared to the cost of sorting out problems once it's in your possession.
The US log books are nowhere as detailed as here in Australia, and accident damaged aircraft won't necessarily show up.
Also, don't forget that GST is payable on the purchase AND the ferry expenses unless you are a company and/or registered for GST. That way you'll pay GST and then recover it when you do your return.