I've always raved about my Asus X99-E WS motherboard for Hackintosh. It's the best motherboard out there for X99, by far. It's not riddled with the same firmware issues you get with the Gigabyte boards.
I picked up two recently because I found them on sale and I thought I might do a couple builds for people. Usually they are $400-500 on Amazon/Newegg/eBay.
I'll let them go for $299/ea for my readers only. If you're interested-- post in the comments. These are the newer 3.1 versions.
As an added bonus, I'll also give you my Clover settings/config so it works right out of the box for you.
If you found this resource helpful; the greatest compliment you could give is a small donation. Your patronage really motivates me to invest more of my time into the community.