I don't know if this should be posted here, or under storage devices, but since the M7 boards (at least most I believe) support the mPCIe Combo III Card which is confusing the heck out of me, I figured I'd post on the MB section.
So right now I am just using a 1TB WD Black HDD. I have a WD Black^2 which is a 2.5" Dual Drive (not Hybrid), with a 120GB SSD and a 1TB HDD but it's not working right and is being replaced by WD right now. I am thinking of possibly selling or returning it though because I will be getting a new one when it comes back from WD. Before I got my current build, just about a month ago, I was using an iMac which obviously has limited expandibility, but I tend to use a lot of space for saving videos for streaming. At the time I had a 4TB Seagate Backup Plus with a Thunderbolt Adapter (the drive crashed, and I lost everything because my iMac's HDD also crashed and was getting fixed, terrible timing). So right now the only space I am using is about 500GB, but I KNOW it will hit past 2 or 3 eventually, but I can always add more storage in the end, so that's why I am thinking of swapping out the WD Black^2 for a standard SSD (hopefully a 500GB).
Here's my problem, I have this nice Motherboard, with many options, and I figure if I am going to exchange the Black^2, I should try to get the fastest SSD solution possible, as long as it doesn't sacrifice use of other peripherals (right now I only have 1 GPU, a GTX 970 from EVGA and Gigabyte's Thunderbolt II adapter with 2 TB and 2 Display Port adapter which was cheaper than Asus'), however I do plan to add a USB Type C and/or USB 3.1 card if and when I get a device that is capable of using it. Speaking off which, not to get too off topic, are there ANY devices that use USB-C or USB 3.1 yet? I've been looking it up and I can't find a HDD, Flash Drive, Phone, or anything that uses either.
So from what I understand, SATA III bottlenecks a lot of the fastest SSD's out there, and there are plenty of PCIe SSD solutions, but which one? Also there's mSATA which I don't really even know what it is, and the mPCIe Combo III Card which just confuses the heck out of me. I know with the combo card I'd be limited by the physical size, therefore also limited in storage and value (since a drive with more space that can fit in there would cost more), and I don't even know how to go about finding the right size which I've been doing for a while now. I have read that a lot of people will use that as a spot for a small SSD as Cache to their larger storage devices. I wouldn't be opposed to getting a 32-64GB SSD as Cache, and a standard SSD for OS and other high tasks programs, or using the smaller drive as JUST an OS bootdrive. I have also seen the option to mount a 2.5" SSD onto a PCIe Card to take advantage of PCIe speeds, which seems like the best solution as far as speed and value goes. The more I research it, it seems like the more confused I get because all of these different options are just confusing me lol. Thanks for any help and sorry if this is a little long.