I just finished some testing on the Intel NUC DC3217IYE I picked up. My plan is for it to become my next Mech controller. It's pretty sweet. Dual core and hyper-threaded 1.8 Ghz processor. It runs my new low latency video streaming software with barely a dent in the processor power. More on that later. The WiFi antenna is built into the case. The package is only about 4.5"x4.5"x2" and it has mounting holes on the bottom.
I read a post earlier about having difficulty finding a mech-friendly a power source for it. I used an automotive laptop power adapter and it works great. I power it from a 4S LiFe battery (12.8v nominal). A 3S LiPo battery is right on the lower end of the power adapter's specs, but I'll probably give it a try before too long. This is the power unit I bought:
You can pry open the case to get the circuit board, which is about 3"x2" and 55g without the cable. I had to change the connector, too. If you want to get a NUC in your bot, this item works well so far.