I've got less than 150 miles on my 2010 WR250R and have already ordered two T63 rear tires to replace the Bridgestone stockers.
On my Dakar these were the perfect dual sport tire, handling both tarmac and off-road great. I had laid in two sets of T63s (90/90-21 front and 130/80-17 rear) for the Dakar, so I'll use the 21s on the new bike and a buddy is buying the 17s for his KLR.
I expect the T63s to last even longer on the WR, since it's about 150 pounds lighter.