I'm looking at the MAXIS "trepadors" . They have had good reviews from what I have found. It's between those or IROK radials. I'm currently running parnelli Jones "dirt grips".
www.offroaders.com/reviewbox/index.php
Top 2 categories, M/T and A/T reviews and info, or on the left in the "tech " section, scroll down, on the right side of the page more info and reviews.