the two most important things to consider with wire gauge are power and distance.
You say you aren't running a lot of power to them, so a lower gauge is probably fine.
How long is the run to the speakers? If the wiring is 50' or more, I'd upgrade to the 14 gauge. If it's only 20' or so, 16 gauge is more than enough. If it's 100', I would even bump up to 12 gauge.
So your mileage may vary, but usually I put 14 gauge in as a minimum. It's middle of the road, allows for more power later, and is a LOT cheaper than 12 gauge. However if changing it out is a hassle, the 16 gauge is fine.
You say you aren't running a lot of power to them, so a lower gauge is probably fine.
How long is the run to the speakers? If the wiring is 50' or more, I'd upgrade to the 14 gauge. If it's only 20' or so, 16 gauge is more than enough. If it's 100', I would even bump up to 12 gauge.
So your mileage may vary, but usually I put 14 gauge in as a minimum. It's middle of the road, allows for more power later, and is a LOT cheaper than 12 gauge. However if changing it out is a hassle, the 16 gauge is fine.