I placed an order for the MSI X299 Gaming Pro Carbon and the i9-7900X at Newegg, which also offered $50 off for the combo deal, along with a free Corsair AIO cooler included with the motherboard. After thoroughly researching all the available X299 motherboards currently available, MSI's X299 Pro Carbon hits the "sweet spot" for me and my intended use - 3D modeling and rendering, 4K video editing, and processing thousands of digital photos, including Adobe and HDR photo processing. I will be using this setup with a GTX 1050 Ti that I already have. My gaming rig stays the same - an MSI Z270 XPower Gaming Titanium, i7-7700K, and two MSI GTX 1080 Ti Gaming X GPUs. Yes, the Pro Carbon draws more power and runs warmer, but beats the more expensive Asus and Gigabyte X299 motherboards in numerous reviews that I have read.
For anyone who thinks that $1000 is expensive for a 10-core 20-thread CPU, I grew up writing some BASIC programs on a Commodore 64. I worked part-time at IBM-Austin, helping IBM to build the IBM PC/XT and PC/AT while attending college at UT-Austin at the same time that Michael Dell was building and selling his PC clones from his UT-Austin dorm room. I used my very generous 50%-off IBM employee discount to buy a fully-loaded IBM PC/AT in 1985, which was the most powerful PC when it was initially released with its Intel 80286 processor and 640-KB of memory. The IBM prices for my fully-loaded PC/AT? $6400, including an enhanced graphics monitor and two dot matrix printers. I paid $3200 after IBM discount. The average smartphone now has more computing power than that $6400 PC that I bought in 1985.
For the AMD zealots who say that Threadripper will rip the threads off the i9-7900X, you need to know about the history of Intel vs. AMD since the 1980s. Intel is purposely not releasing the rest of their i9 CPUs sooner because they will wait to see what Threadripper has to offer and then adjust their own i9 CPUs to outflank and leap past Threadripper. Both Intel and Nvidia have been outflanking AMD, both on technical merits and marketing leverage, for decades now. When I was working at IBM during the mid-1980s, IBM hired some of the former AMD engineers and technicians when AMD broke their no-layoffs policy in 1984. And ever since then, AMD has had mass-layoffs every 3 to 5 years because they cannot sustain competition with either Intel or Nvidia.