Sailorman what do you recommend for my next one? We live on a boat in the summer which obviously is a really really bad place to have any sort of fire.
I'd recommend a mod that takes separate rechargeable batteries. With separate batteries, you can be sure to get top quality batteries, and a top quality charger. For a charger, I'd recommend a Xtar, as it is priced reasonably. You could get a Pila, but it's far more expensive and probably not worth the extra money.
As for what mod, it's up to you. Whether you want to get into variable voltage or not, is the first decision you need to make. Then, it depends on your budget. For a fixed voltage mod, you cannot beat the Silver Bullet or the smaller Baby Bullet for flawless performance and incredible durability. They are both virtually indestructible. I have dropped my BB overboard in salt water, out of moving vehicles and ran it over with a truck and it still works great. For a variable on the budget side, the new version Lavatube is a good introduction for less than $100. The Provari is the best if money is no object.
If safety is a the biggest concern, the main thing is don't get an ecig that is, in fact, a battery. Their chargers are notorious for failing. They don't always cause a fire, but they're not at all reliable in the long run.