i like the tumbler in the newer Batman movies, but am also a big fan of the classic racer style batmobiles. heres one i just modelled in blender.. renderred in cycles

yes i have to tweak it a bit more to reduce the noise

the model is now available on Blendswap - http://www.deviantart.com/users/outgoing?http://www.blendswap.com/blends/vehicles/batmobile-classic-racer-style/