Singular consolidation. Prior to the arrangement you see now, I had the two 596.17 GB disks in a RAID0 configuration, creating a 1.1 TB partition. The 1.8 TB disk was always by itself.
The reason it's the way it is now is also why I didn't bother showing you Disk 0: Disk 0 is a 160 GB drive that is divided in half. Half of it holds a Windows 8 CP NTFS partition and the other half is an HFS+ partition I run Mac OS X on. There's no point in showing you this as half won't be important and the other half won't even show up, really (it just appears as an unnamed partition). I couldn't RAID the other disks like I had before because it makes it impossible to boot OS X if you're not running in AHCI mode.
So, I'm left with all this disparate space that I didn't have before and I'd like to just clean it up for the sake of convenience. However, if it's not really worth slamming all three partitions into one volume (I know about dynamic disks but so far I haven't found a utility that'll let me create one without paying money for a full version), then I'll just create a spanned volume between the physical disks and then extend the boot partition back into the unallocated space on its drive. I'll figure out how to make use of my space once I'm done with that.
The reason I thought all of this would be necessary is back when I was running the RAID0 array, I had more data on the striped volume than was the capacity of either drive in the array. However, much of that was also bare files that weren't part of an installation (such as videos and ISO images) and that stuff can be put onto the 2TB drive this time.
Anyway, thanks for your input.