I like SuperMicro motherboards, was using the X8SIL-F-O with a Xeon X3450 in it and VT-d worked fine on that, I've now upgraded to a X9SCM-F-O and an E3 Xeon and it works on that too. Only caveat is that you have to use a Xeon instead of a desktop processor.
Nice thing about them is they have dual Intel 1GB NICs on board, and 6 SATA port and even a dedicated IPMI port which is extremely handy in a home lab.