If you're into wide angles, the Tokina 11-16mm is probably the best bang for buck. With the f/2.8, the bokeh is quite nice and you'll also be able to take pseudo portraits with some effects. It also does well for auto photography. I've used my Nikon version for many more photo effects than I originally anticipated. Good luck!!
'09 335i /i\ ZSP /|\ CA /i\ Piano Trim /|\ BMW PE /i\ AG M359