I really like the new HDH solution as it's simple, more affordable that an spod and can be mounted just about anywhere as you can see here:
http://wayalife.com/showthread.php?6682-Wired-HDH-Relay-Box-Install&highlight=road+engineering
I run an Off Road Engineering switch panel and it works much like the HDH, is still cheaper than an spod and can be mounted just about anywhere too:
http://wayalife.com/showthread.php?264-Moby-s-NEW-Off-Road-Engineering-Custom-Switch-Panel-Installed!!
Here's another solution for the Off Road Engineering that Holeshot came up with...
http://wayalife.com/showthread.php?8429-Offroad-engineering-(ORE)-switch-panel-install
The sPod is a good setup and you'll find that lots of people love it. I personally would never buy one because of the shady business tactics the owner employs. Specifically, I've caught him red handed pimping his product on JKF while pretending to be multiple regular members on the forum. He literally had conversations with himself in an effort to talk people out of doing what you're considering and justify the cost of his product. I know things like integrity don't matter to most people these days but, they still matter to me.