My WR250X currently has Bridgestone BT-003 tires on it. I probably have another 1000-1500 miles left on the rears, but I'm going to be doing a long weekend trip here soon, so I'll be taking the BT-003's off and putting on a fresh set of BT-090's. These are the same tires the bike came with from the factory and I really liked them... they should work great for my weekened trip.
I ordered them from Motorcycle-Superstore.com....
Front Tire: Bridgestone BT-090 Battlax (110/70-17)
Rear Tire: Bridgestone BT-090 Battlax (140/70-17)