Yes, that would be perfect.
You wouldn't really need a Double pole switch for a low voltage DC project, single pole would be enough.
Here you can read about the differences in most switches.http://www.kpsec.freeuk.com/components/switch.htm
The one you've chosen is a dpst. (The picture on the list shows a rocker switch, but internally it works the same)
For $5.57 I would probably search a switch in an old piece of broken electronics...
Dip switches do have an advantage over other switches, something I realized after responding, you can easily place one in a breadboard. Most other switches have to be soldered.
Still, built fragile and not capable of handling too much power, I'd rather not use them to turn on/off a complete project.