Just to add about SV-9000 and other drive manufacturers on the market - visit http://www.investors.vacon.com/722.html
(OEM for SV-9000)and see who is who on the VFD market.
My choice is Yaskawa, reliable, well known and service friendly. Support is good too.
Their G3 series drive was the best...
I was really surprised when you said that Yaskawa doesn't repair their motors here in US, or won't be able to help you. The problem is to find right contact person. Yaskwa has full servo motor repair shop in Illinois and they do a good job, expensive but relaible.