The main expense is the jig so straighten the chassis out.
Other than than, your not looking that much for everything else, wing, headlight, bumper, wishbone... etc...
Your main problem is insurance.
Are you fully comp?
If its your fault you'll have your excess to pay anyway, so you might as well accept the figure they give you for the car (probably wont be worth buying it back as Cat C and fixing it cos your premium will go up loads on a Cat C).
If your 3rd party then youve got your excess to pay (to the other car? the council probably wont chase you for 2 sign posts). How much money you got to play with?
If you can get away without involving insurance at all, id personally try fix it up first, at least ring round for some cheap jig quotes.
Good luck