I had a small accident, I sort of need help...

[TT]

I'll try to be as short as possible especially since the "how" is not that important, but well, yesterday I was reversing out of a parkplace, checked in the mirrors, all was fine, turned my lovely head.. all was fine, GO! ... BOOM!.. LOL, an Ibiza suddently appeared, passing by in the small road and got hit by my mighty rear bumper's left corner... since we were both moving, although not that fast, the damage in his side was pretty impressive for the speeds involved

The sad part is that it's my fucking fault... luckily my car didn't suffered to much of a damage... here are a couple of pics









Yes, I know, the car is sure very clean

The corner of the bumper was slighty deformed, ence those plastic strip bumped out of its track, but I managed to make it slide a little so it remains just some scratch in the paint and the invisbile deformation.. and maybe some special polish would fix that too...

Well here is the question... any idea about how much could be asked to fix the damn Ibiza?
I talked with the guy today (and already informed my insurance and launched the "thing").. he already quickly went to a garage where they warned him that maybe he will need to change the whole body part..
Ah yes, I hit him some 30 cm in front of it's rear wheel, then since he was moving forward, the damage is also a little on the overfender and on the side of the rearbumper (very minor here)... the garage said the "hole" beeing to big, the won't maybe be able to have mean to apply the force to bump it out.. in that case they would need to change the bodypart...
The car was luckily "only" a small Ibiza (the last model) and not a Maybach but still, I'm pretty worried about the price.. if there is to buy a new body part, paint it and fit it.. the price risks to rise quite quickly..

And since I can't wait for the results of the investigation of my insurance, i was wondering if somebody can maybe already shoot some prices right away

Basically if it would be less than around 1700 USD it would still be better to pay it myself instead of the insurance to avoid rising to much what I pay yearly to them... but hell, if it would be close to that I would be seriously pissed off!!
Of course if they could simply bump out and polish the Ibiza it won't be even close (I hope.. because here in Switzerland it's not cheap at all when you have to do such things..)

Any ideas...