if i am not wrong.. bokeh depends on not just how far your subject is to your camera.. but also how far the background is to the subject as well.. you can get bokeh effects with even a cheapo 18-55 if the conditions are right..
if you are only wanting to experiment with depth of field effects.. get a prime.. it's cheaper.. and you'll probably get more fun out of it.. (but your d60 won't be able to autofocus la.. you should have knew this restriction when you got it)..
cheers..