Struth Baz-that's not good,you sure have had some bad luck this year-the 5D2 in the water and now this.
Very sorry to read,-not sure if this helps-but try your house hold insurance,you should be able to get a new one.,through it.I was very specific when I sat my insurance agent down and discussed all this camera gear/telescope stuff I own.I made a list of gear,I took photos of every thing I own and gave them the list and disk.All serial numbers etc etc.
Your episode is most unfortunate,but if out in the field and this happens to gear,I know I would be a little comforted by knowing I have done my best with insurance mob.They have been very good when I had a small claim-on a antique lamp a bat(as in flying marsuipal) knocked over.
I got a EX 430 I might be able to loan you,but it would be on the previso-for only studio work-not your out door adventures

They read rather full on-even more hard core than my 'fierce creature' adventures.
good luck with insurance-well worth the call.