All my tires are set up with stans tubeless system, worth it to me for preventing flats and the lower pressure. Lower pressure makes all my tires grip better.
I run Continental Mountain King 2.2's on my 26" rigid SS, I have the Supersonic version and they grip very well. They don't seem too durable (well they are super light so no surprise there), and I have a small tear in the sidewall of one, after maybe 5 months of riding. I wouldn't recommend these with the stans, but the protection sidewall ones may be good. ( see next paragraph) I ride these on my local trails in swansea, mostly loamy, smooth singletrack.
I use the continental gravity 2.3 with protection sidewall on my fs rig and they are much burlier and make a much better tubeless setup. I don't think they grip the loamy stuff as good as the mountain king, but with this bike I can just roll over stuff as opposed to threading a line so I like em. I ride this bike mostly in technical singletrack, Freetown, Vietnam, Borderlands, etc.
I also just got a 29er and it came with stock maxxis ignitors. So far I like them, but its been tough to judge anything because of the switch to the 29er and the rapidly changing conditions (dry/muddy/frozen/complete swamp) we've been riding in lately.
Hope this helps, I guess my point is I'm on a Continental kick, I like the tires and the rubber compound, and if you search you can find deals occasionally.