You have $300 to build a Nengo accelerator. Post your specs!

Imagine yourself at a new AI-based startup company. Everyone else is busy with deep learning fads, but you approach your boss and suggest going in the direction of spiking neuron systems. Humoring you, your boss gives you your own standard everyday desktop computer without a GPU (thanks to the deep learning crowd, of course!) with a $300 allowance, and wants to see what kind of specialized hardware system you’re able to turn it into. What would you build, and what kind of performance increase would you expect to see?