which is the best motherboard with 3.0 usb support ?
EVGA Classified
ASUS Rampage III
Gigabyte G1.sniper
etc etc
what is your budget and which processor are you planning to get?
Go with sandy bridge core processors and for mobo check P67 chipset based mobos like:
ASUS P8P67 Deluxe
Intel DP67BG
Gigabyte GA-P67A-UD7-B3
MSI P67A-GD65
Note that P67 chipset doesn't come with onboard GPU.
About Gigabyte UD7 : Performance and Reliability is good, the only thing is the price tag it has. Asus is much better with Warranty issues. Atleast with me. Gigabyte has the Usb 3 options from UD3 - UD2H series i guess or whatever says 333 on the box.