12V to toggles?

So All I have left to get for my front bag set up is fittings but thats going to be next weekend. As for now I want to start running the wires and airline. I have tried searching but the only thing that I cant find is... What are you tapping into for your "hot" wire coning into your toggles, or your constant? Are you using an accessory, or coming from a constant that is hot even when the trucks off, or what? Pros and cons to either one? Thanks in advance.
Neil

Well here's my 0.02 - I have a on/off toggle mounted somewhere easy to get at but in a location I won't accidently bump it. It is wired straight to the battery (thru a fuse of course). If I want the switches to work when the key is off, no problem. If I want the switches to not work while driving, again no problem. If some joker brakes in, they have to know where the power switch regardless if they hot wire the truck. Again, this is how I run mine.

^^that sounds like the most secure way to do it and i am wiring mine the same way

Thats a cool idea. Especially since my last truck was stolen, I am all for extra security. So what size wire and fuse are you running from your battery then?