If you dont want to spend money on all the NOS parts, why not make it something a bit more "personal"?
maybe a different headlamp for better night riding (the Acerbis ones are good), little bits and pieces, paint the plastics and the tank up nicely with rattle cans and add a seat cover.
there will always be anoraks who say it isnt original, but theres a difference between being Original and Functional, i know which i'd rather have...
BTW i think im gonna have to put new alternator brushes in the jawa, seal up the carb, put some different forks on and sell it on, need something like a 250 four stroker to get around on...
a big DT does sound very tempting though.... hmm...