The Ritchey's are my 'training' tires. I have no complaints. They corner really well on grass.
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2013 Kona Jake, 2008 Kona Major Jake, 2013 Kona Jake the Snake, 1999 Kona Muni Mula, 2012 Ridley Excalibur, 2008 Surly Long Haul Trucker
What are your courses going to be like?
The Ritchey looks like a good choice for hard pack and grassy courses. The Kenda could be good as an all-arounder. I don't have experience with either tire. If you're likely to see a lot of mud, check out the Clemenet Crusade PDX. I haven't tried those either, but I've heard good reports from a guy who has.
I'm really happy w/ my Ritchey Excavader Cross Pros. I haven't tried anything else on my cross bike, but i've done lots of tire experiments with mountain biking and i've been really pleased with these during cross training races, real races, and single track.