I am so sorry for your loss!
I would do what feels right to you. You were in contact with these people so you have a better feel for them than anyone. If you feel that they are good breeders and that this was just a tragic freak accident then I would say go ahead and get a different puppy from them. If not, I would tell them that the loss is a little too much for you to get another so soon and ask for your deposit back. That way you can go to a different breeder if you want or just give yourself some time to mourn before you start looking again.
Once again I am so sorry.