Get a RayDiaTor Triple. Made of steel and titanium. The tube and bowl and the screen it comes with are all titanium, which oxydizes at a *much* higher temperature than steel, so it's basically as healthy for you as glass, yet nigh indestructible. You might be able to break the colored glass decorative tubes on one, but you'd have to work at it, and even if you did, the pipe would still work just fine.

Here's a pic of mine, and I freaking love this thing!