A proper way to filter water is pretty much the only thing (piece of gear) that I do not have covered already in my gear (not considering the Micropur MP1 tablets).

I am leaning towards the Katadyn Vario filter... straight forward filter, two filtering speeds, good reviews. The SteriPEN looks like a good idea but for some reason, i'm still not convinced.

The fact that the filter gives you good drinking water instantly is very appealing.

Boiling water looks simple enough, but it can get annoying. Especially after a tough segment where you would KILL for some water when you realize you are dry...

My 2 cents.