I spent a month trying to find decent tires for 24 with no luck. These really are your only options. I went with the Kenda mainly cause it comes in the stickiest compound. Its so fuckin heavy though. Even with all the knobs cut in half its still over 1100g. One of the main reasons i got a 24 was so i could build a lighter bike. Ugh! Hopefully someone comes out with something soon. I acctually went so far as to write to all the tire companies about it but Continental was the only one who replied saying they had something in the works.
That 'in the works' Conti tyre is probably Danny's signature model though, which I'd imagine won't be of much interest to anyone looking for a "pure" tyre. Ironically, there was a lot of choice a few years ago, but then the rest of the MTB world 24" market died on it's arse (to an extent), just as our's picked up. For example in the UK now I think the Maxxis importers are only importing 1 type of knobbly 24" tyre now (just one variation on the Hi Roller, whereas before there were around 3-4 variations of them, plus the Swamp Thing, and possibly even more). Same for the Schwalbe Big Betty tyres.
All their other tyres are just re-branded Kenda (well, not re-branded, but sold as Echo) tyres, and they stock the Kenda Kinetics as standard, so I wouldn't have thought there was much incentive to spend a bunch of money creating their own.
I have ridden the Halo Choir Boy Lite several times now and I like it. Medium soft compound - not gummy bear soft but grippy, medium weight walls, 2.2 wide. It rides pretty nice. Weight is a bit over 900 grams. It cut half a pound off my back wheel. It's a lot narrower than the blue groove though.