The witnesses I support and would suggest is @timcliff and @pfunk. I've taken the time to get to know them and feel they will be around and continue to add value to the ecosystem.
I'd point you to @timcliff's regular witness updates to the community if you need some validation. A witness taking time to create a semi-regular report of activities, upcoming features, discussions and so on both validates and proves his worth to the community. @timcliff does this consistently.
I also strongly support @timcliff
I definitely support @timcliff and @pfunk as well. They've been very active community members and have put in an amazing amount of time and effort.