Doors and windows can be easily replaced. You might not get so lucky with the floor area. If they have to do a lot of work to straighten the body back out, you might have a total on your hands. The little dent above the B-pillar might be an indication of the body being torgued too much.
I hit a three year old Galant in 2000 with a 1962 Studebaker. Although his car's bodywork was only pushed in @3 to 4 inches, I hit him right where the front door and fender meet. They appraised his car at something like 10K and wrote it off. Although I left a fifteen foot skid mark, I bent the cowl in his car and it would have cost an arm and a leg to fix.
Good luck. Important part is no one was hurt. If anything, you could buy it back and start parting it.