There are still a lot of things that I'm figuring out with witnesses. I tried voting for someone who wasn't running a witness server. I couldn't figure out why the vote kept getting rejected. Ha ha.

There are a number of good ones out there. You can check out the ones I've voted for by going to https://steemworld.org/@themanwithnoname and the going to "account details" then "witness votes." I've only voted for 19 of them, but I try to mainly vote for ones with whom I've interacted. If they're open to talking and helping, then they normally get my vote!