Will this be a trail riding machine or one for racing? The DRZ is heavier than the WR and lacks some in the suspension department, but is quite capable, very reliable and pretty quiet. I think they make good trail bikes if you aren't picking them up often. The WR has some teething problems it seems, but none DNF'd at our hare scramble today. Everyone seems to open up the exhaust on these things (to get more power or to make them sound more powerful?) and noisey bikes are good for no one IMO. In a nutshell Race=WR and Trail=DRZ, at least until the Yamaha gets the first year gremlins fixed.
'12 Honda CRF250R, '03 GasGas EC300, '75 YAMAHA TY80 <Since 2001> '71 Honda Z50, '00 KTM 380EXC, '03 KTM 65SX , '03 YAMAHA PW50, '06 Suzuki DRZ400S, '03 Kawasaki KX100, '08 YAMAHA YZ450F, '07 YAMAHA YZ250, '07 KTM 250XC-W