I would think the DR-Z400S might be in the mix here. By all reports it has more grunt and is more street friendly than the WR250, but lighter and more dirt friendly than the DR650. Just a passing thought.
Current Ride: '08 DR650
Old Rides:'77 Kawa KZ650, '79 Yamaha IT175, '79 Suz GS1000, '80 Suz PE175, '82 Honda XR200, '83 Honda 750 Interceptor, '84 Husky WR250, '86 Husky WR250, '87 Husky WR400.