If two of your monitors are the same and share the same port type (DVI/HDMI are same), then three monitors should work. See http://en.wikipedia.org/wiki/Intel_HD#Three_active_displays
For sure these boards work: Sapphire Pure Platinum H67 IPC-CI7S10H67, GA-Z77-D3H, KINO-QM770-R10, and...