Sorry to hear about the mishap, pretty gut wrenching I know.
I had a similarish experience with a Canon A640 a few years back, in my case it was only the battery flap and part of the case that was damaged. I thought it was going to cost a fortune to repair but one day I plucked up courage to send it off for an estimate thinking the worst.
In the end it was £25 including parts, labour and return postage, they were a little old fashioned sending a full quote in the post but they did a good job.
These are the people I used, maybe worth a phone call at least.
I guess it is a case of weighing up the cost of repair against a replacement, it may also be worth checking out your house contents insurance to see if it is covered.
Good luck.