Unfortunately the problem will be is that it will most likely happen again.
I would only get another cat if you where wanting it as a indoor cat.
You get many people who dont believe in keeping cats indoors and alot of people think its cruel.
But i think of them a bit like dogs, i wouldnt let my dogs roam the streets unattended as they would get knocked over by a car, stolen or hurt by some sadistic person, a cat is just the same and the sooner people realise that a cat can have a full happy life indoors the less little lives will be lost.
My cat is a indoor cat, shes a happy little camper, you just have to stimulate her a bit more, making sure she burns of some energy!
The vet was extremely pleased at the idea of keeping her indoors as she finds it very distressing the ever increasing numbers of dead and also badly injured cats that come into the surgery that have to be put to sleep. She felt that in todays society, cats just cant integrate or survive in built up areas.
Im not saying you should keep your cat as an indoor cat if you do ever decide to get another. It would just save alot of heartache and upset if you where able to keep him/her indoors.
Wish you all the best in the future.