This thread seems to sum it up nicely: http://forums.overclockers.com.au/showthread.php?t=930620&page=101
"None of the ASUS Z77 motherboards support VT-d. Not even the $450 "workstation" model. Or at least, VT-d is not mentioned anywhereby ASUS.
Gigabyte Z77X-UD5H supports VT-d, UD3H does not. I'm not paying an extra $100 for VT-d.
Most (or all) MSI Z77 motherboards support VT-d but may not support offset voltage or turbo overclocking.
Most (or all) ASRock Z77 motherboards support VT-d, support offset voltage, and turbo overclocking.
It really boggles the mind how ASRock has seemingly got more things right more than ASUS, Gigabyte and MSI."
I love that last line; something extremely strange is going on here =/
Anyway, I think I'm going to go ahead and give ASRock a shot. I'm leaning toward their Mini ITX offering: http://www.asrock.com/mb/overview.asp?Model=Z77E-ITX
