I gave it a little thought and decided to repurpose the UNBRANDED back to what the frame calls for: mountain biking. I gathered up the parts from the parts bin and converted it to a singlespeed.
HOLY SHIT! I forgot how much I love singlespeed riding! It was so nice to mash through climbs and rely on momentum - it's a whole different style of riding that I took for granted... there's something about a direct chainline to your pedal stroke that just feels right.
This bike is 100% analog - v-brakes, rigid fork, skinny tires, ancient wheels, and an old 110bcd crankset with a square taper bottom bracket - a little throwback to the pieced together "winter" bikes folks would ride to protect their multi-speed race bikes from the harsh elements. There is a purity to riding these types of bikes that modern parts just can't compare to: I guess it's like listening to music on vinyl.
I do not intend to change this bike to geared, nor do I intend to upgrade any parts on this bike; I want to leave it AS IS, replacing only things that break (the On-One Inbred 26" frame does sound appealing, though). Selling it would be futile - I would probably only get about $200-$300 on Craigslist. However, the enjoyment I'm going to get out of this bike does not have a price tag.