2012 Mac Pro - 12 core version with a SSD for a boot drive.
Or you can buy a 2009/2010 Mac Pro and do the upgrade yourself and save some cash....
Musicman is in the know about this stuff...and there are threads here about it.
When purchasing make sure it comes with the appropriate OS install that PT10 supports
Here is the compatibility chart
http://avid.force.com/pkb/articles/e...tibility-Chart