Ordered the Asus X99 deluxe with the 5930k, and 32 GB RAM. Seems the faster RAM is still expensive and wasn't any available for shipping currently, so I got rather cheap 2133 mhz and will do with that for now and get 64 GB ~3Ghz once more vendors are available and prices drop. Already have 2 x 512GB Samsung 840 SSDs + a couple others.
Ordered a cheap PCI-express SSDs too.. that probably won't be of much use.. but gonna try and see if it can work with PCI passthrough in VirtualBox or VMWare to install a virtual machine on.
Yeah, i ordered the X99-Deluxe and 5930k as well. Got 4x8 GB of G.SKILL 2400 memory; I want 4 slots open for later (probably to drop in a 4x16 kit in 2016 for a total of 96). G.SKILL isn't my favorite, as I've had dead modules from them in the past (more than once). Their customer service has always been really good about getting it replaced though. Still too bad that Corsair isn't making 8 GB modules. Would've put a few extra bucks in for that.
The Asus was one of the few Thunderbolt ready boards, which surprised me. I thought Intel's new flagship platform would be all over the Thunderbolt thing, but apparently not? I don't get it. There was a big surge of Thunderbolt in Z87, and then it kinda died off for some reason. In any case I want it, so it was down to Asus and Gigabyte, and Gigabyte's board had a lot of gamer/overclocking garbage.
As far as the PCIe/M.2 SSDs... there aren't really a lot of options, and they're hideously expensive from what I've seen. I'm just going to get the 850 Pro for the main drive, and the array of WD Blacks or similar. The VM pass-through idea is cool though and I'd like to hear if that works (and if it's preferable to raw access to a SATA drive).
Choosing a case might be the hardest part. I went to the local Microcenter to check out some cases today evening and good god do most of them suck. Right now the Corsair C70 is the easy front runner.
As far as actual performance for dollar... Z97 and 4770K is almost certainly the better choice for nearly everybody. I had misgivings about doing the X99 thing several times during all this. Ultimately though, I'm doing enough production-type work, notably 4K video, that these more aggressive platforms are worth it. A traditional "recommended" system for that sort of thing is dual Xeons. Go price out the CPUs and motherboard for that. Six cores and a 3.5 clock is just about perfect for me. Plus the X series platforms are meant to last a good bit longer, and I'm anticipating being able to make effective, useful upgrades through 2018.