The Asus X79 Deluxe seems to be out of stock at Newegg except for open box deals
Amazon only has the Asus X79 Deluxe through resellers
I did some digging through the handful of X79 offering Newegg has and I keep finding comment stating that UEFI update had to be done to get the board IB-E ready. So it doesn't seem like you can really dodge this on any of the models that debuted with SB-E (which is nearly all of them).
My preference is for Asus with the X79 line. Mine has treated me very well and I've been pleased with the support (19 UEFI updates in two years shows a product with active development/support). I also feel the actual UEFI interface and options are top notch. The P9X79-LE saves some cash and the Sabertooth, P9X79-WS, or the X79 Deluxe would all be great higher end choices.
I'm pretty sure we have some ASRock X79 and Gigabyte X79 users who are happy too. So it's a roll of the dice at this point.
I'm going to bow out at this point and see if anyone else relays their X79 experience.
"Welcome back my friends to the show that never ends. We're so glad you could attend. Come inside! Come inside!"