If you are ready to Get another Collie Look in your Local Shelters for adoption.
Like you, you lost your Collie to an accident; there are animals in the shelters that have lost their owners in the same way, for this is way they are placed in shelters for a short time before they are put to sleep if not adopted.
Also look at http://www.petfinder.com/index.html there are Furbabies there that have been taken from their owners for abuse or neglect they need a loving home.
Wish you the best of luck.