Boot Camp Cannot Partition

I have issues. 😕

So here we go...

My main issue here is I cannot partion my system with Boot Camp Assistant. As far as I can tell I've followed every step correctly to this point.

• Everything is updated
• I had Microsoft send me a new, full version of Windows 8 Disk to use
• I purchased a new 32gb thumbdrive and formatted it correctly
• I downloaded the all the Windows Support Updates to the Flash Drive

So far I can't get past this error:

For some reason I only have two options for the size of the partition:

or

I'm using this thumbdrive:

And this is the current state of my iMac and Storage:

I only need Windows to run a single program so I really don't need anything but the minimum here...

Any ideas on what the heck is going on?

Thanks in advance,

-Jared