I wanted to build a machine for audio and video production. As you can see by duplicate items purchased with varying prices, this was not a "all at once" build. I certainly could have done it cheaper had I waited on certain things, and that is a lesson that I will remember for my next build.
Initially, I only had one SSD and the Toshiba 2.5" drive, which I had actually pulled out of my laptop. Later, I pulled the SSD out of my laptop and added it to the Toaster to run Raid 0 with my drives. It ended up proving almost useless to do this, so I eventually dismantled the array and opted to install Windows 7 on one SSD, along with some apps, and the rest of my apps are installed to the other SSD. The hotswap bay was purchased so I could remove the drive cages from the case while still using a regular HDD. It may have made sense to go with a Define S for this reason, but I really wanted the 5.25" bays.
I had originally used the X99-A, but recently switched for the Pro after an issue with the board that couldn't be repaired. At the same time as this, I added the second kit of RAM.
Anyway, I'm pretty happy with this system.