The eVGA board was designed by nVidia... it's the reference board. Of the 680i boards out there, this one has the most mature drivers, and likely gets the most attention with regard to bugs in the nVidia labs, as several board partners are affected.
Reference boards are offered by six board partners: eVGA, BFX, XFX, ECS, Foxconn, and as of last week, Albatron. Biostar is rumored, but as of yet nothing is on the website about a 680i board.
All reference boards are produced in the same facilities with identical components by a single, contract manufacturer. The only differences are the packaging and accesories, with the exception of the Foxconn board- branded heatsink on the chipsets. Not too surprising as Foxconn is likely the manufacturer of all of the reference boards, being the only one on the list with the capacity to do so.
Any board off of that list is going to perform identically. Go with the best deal the day you buy it from any of them.
If asked what the best 680i offerings were, I am liking Gigabyte and MSI the best. Both boards designed in house, both with unique features... both last to market due to, in my opinion, a higher standard for compatibility. Both excellent boards, just now beginning to ship in quantity.
Happy Building