How much of the work are you intending on doing yourself? If you're willing to only deal with the cost of parts, then you're likely to save about half the cost of the repair. I'll list out the procedure, part, and cost. (bikebandit.com)
for instance, getting the bike into riding shape.
1) Replace the bent handlebar.
Undo the bar end weight. It is (usually) held in by a hex socket bolt. Remove the grip, lubricating it with water as needed. Remove the lever mount, and the switch box. remove the handlebar insert from the riser by loosening the mounting bolt on the riser-end of the bar. A new handlebar insert is 46003:
HANDLE, and will cost around 35$. Assemble in reverse order. At this time, make sure the handlebar riser itself is not damaged or warped.
2) check steering alignment and forks for damage.
check the fork tubes for bends and creases. repair / replace as needed. To do this, you need to remove the front fairing, remove the headlamp assembly.
run your hands over the fork tubes, making sure they do not have bends or ridges. To check alignment, look at this link here from the ninja250 wiki.
http://faq.ninja250.org/wiki/I_need_to_realign_my_forks_and_front_wheel.
Cost for new tubes (if creased) 44013: PIPE-FORK INNER is 134$ per tube.
I don't know about triple tree alignment checking and correction. Finding a front end from a donor bike is likely to be more economical.
3)Gear Shifter is broken. You are likely to need to replace the shifter pedal.
loosen the pedal axle bolt using an hex head wrench. loosen locking nut holding lever to the shifter rod, and unscrew the shifter pedal from the rod. Replace in reverse order.
13242A: LEVER-ASSY-CHANGE,PEDAL $32.22
4) Fairing: depends on what you buy. or repair. A can of ABS plastic won't cost you much. If you put in the work, you can usually repair a good bit of plastic. If you are going to discard the broken fairing, I'll take your plastics off of you.
http://faq.ninja250.org/wiki/Plastics_repair_with_ABS_cement
http://faq.ninja250.org/wiki/One_man's_fairing_repair