I am liking the Prime X299-Deluxe which has Dual Gigabit LAN ports, 802.11AD WIFI, and the Thunderbolt EX-III card, (though I had dismal results with that card in my X99-Deluxe II), but that baby is almost $500. I have not seen pricing on the ROG version yet.
As for CPU, I would go with the 7900X as I refuse to buy another 28-lane CPU. So an upgrade to the X299 platform means $500+ for a MOBO, $1K for the CPU, and then $400 for G.Skill F4-3200C14Q-32GTZ or similar. Plus a new AIO or custom loop to cool the beast. So probably a $2.5K to $3k build by the time accessories are added.
There are 4 things holding me back (actually 5 if you consider money).
1 - Having to buy a 10-core CPU to get 44 PCIe lanes.
2 - Intel VROC non-sense. I am NOT going to buy Intel SSDs to set up a RAID array.
3 - TIM instead of Solder on the IHS.
4 - Thread-Ripper, though the jury is WAY out on that one.
WHY does Intel not do everything the way I think it should be?