Best Way To Connect Arduino For Semi-Permanent Installation

I'm doing a sound installation that will be up for 2 months. I'm trying to figure out the best way to connect my Arduino. I'm using 20 outs, so lots of room for bad connections if it isn't sturdy. A breadboard seems like a bad idea. I was thinking of buying an Arduino Nano and soldering wires to the pins. Is that the best way?

Look for Crossroads' screw shield. That's pretty good for connecting real wires.

Those screw shields look pretty robust, but soldering is also a good way to make a permanent connection. Rather than solder directly to the board, you could install pin headers and solder the board to a perfboard.