Perculators are basically a form of double-filtration. I know some bongs have perculators that don't come out, but the whole magic glass line does.

I use a ROOR. Every ROOR looks the exact same, and it's a big company, which are both downers in my opinion. However, with a diffuser and a custom bowl, I've never had a bong that got me higher with less weed. It cost me about 300 overall (I bought a lot of cleaning equipment and a bag, too) but it's probably saved me twice that in weed. Plus, it's really hard to break. Trust me, I almost broke a glass table with it.

P.S. Ice catchers are the shiznit. You heard me.