It's an interesting thought that you can put like $6,700 worth of hardware on this board before you've even put it in a case.
ASRock X299E-ITX: $400
Intel Core i9 7980XE: $2000
HyperX Impact 64GB 2400 Kit: $680
Samsung 960 Pro: 3x2TB RAID: $3,615 (yeah, I know)
And for fun, let's build the rest of the system in an NCase M1:
NCase M1: $180
PSU: SilverStone SX800-LTI 800W Plus Titanum: $175
CPU Cooler: NZXT Kraken X52: $150
Graphics card: EVGA GeForce GTX 1080 Ti FTW3: $800
Total: $8,000 
Add another $1,000 for premium custom water cooling if you're into that.
