meray bhai why dont you go and check Auto Club? it's in I-10.
as far as i know he's got the best denter and painter in islamabad, and since i have taken my car to them aswell i would suggest them over any authorized dealer.
So, before you go to Honda Classic, just go and check them out. I am sure ull be impressed with their work. Meet with either Abid or Azhar. Service advisor's and good ones. Atleast they will give you their honest opinion unlike authorized dealers who will try and rip you off.
their address is:
Plot # 214
Grid Station Road