For posterity, I was able to track the problem down to what appears to be an 
issue with the netvm acquiring pci devices that should ostensibly be network 
controllers. I wasn't able to get anywhere by simply removing my RAID 
controller so I removed the GPU (ATI HD) and was finally able to complete an 
installation on integrated graphics. When I reinstalled everything and booted 
back into Qubes networking was no longer functioning. I opened the netvm's 
settings and noticed that the only PCI device it had captured this time was my 
RAID controller:

RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2108 [Liberator] 
(rev 05)

I was able to get things running again by shutting down the netvm and its 
dependents then manually reassigning PCI devices. 

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