My main processing machine is a Ubuntu box running 14.04 with PostGIS and TileMill. I generated my tiles and the resulting mbtiles export is about 250MB (megs, not gigs). The PI runs python, has a storage card big enough to keep the mbtiles export, and wifi. At most, I might have 2-3 devices accessing the endpoint requesting tiles. Typically, only one device will be requesting tiles.
Keeping in mind, I prefer simplicity with minimal hardware requirements over a feature-rich server, what are my options for serving up the tiles from the mbtiles with a PI 2?