I plowed through 10 seasons of the X Files (and both movies) and the one season of The Lone Gunmen earlier this year and I've been looking for something to fill the void. Several years ago I started watching Fringe which certainly had an X Files feel to it. Unfortunately Fringe season 1 is pretty rough. A buddy of mine has been telling me for years that Fringe really gets awesome and just stick with it, but I gave up near the beginning of season 2. I thought I knew what the big reveal was and it just didn't live up to the hype for me. Still, in my desperation, I had to watch something, so I figured I'd give Fringe another go.
HOLY. SHIT.
My buddy wasn't joking, this show gets damn awesome and I had quit just before it got awesome. The episode "Peter" in season 2 (episode 16) is where it gets amazing. I mean, there are decent episodes before this, but after this it's just great. Is it as good as the X Files? Well... probably not, but the mythology of Fringe is much better than that of the X Files. So that's what I'm watching now, I'm about midway through season 3.