>> Still don't know which way to go as I know I could give this little lad a good home but could not cope with vets bills other than excess.
May I ask, why this particular puppy?
Is it question of bloodlines (you may have had a related one before).
Is it just the fact that a new puppy in your present situation would be a positive step for the future? (I am not going to knock that, as I have seen it work well in my own family; sometimes a dog can do what other humans can't in terms of solace and motivation).
I suppose I am asking: why this particular dog.
As to the jaw issues you have had great advice here and the breeder is willing to help out if needed. That's an enormous plus in my book (just get it in writing!).
How will you feel if you don't take this pup?
Will it be a feeling you have missed out, or will you be a little bit relieved you won't have the bite issue?
In the big picture, a misaligned jaw is the not the end of the world, especially if the breeder is happy to work with that and give future support.
[Toss the coin, and think to yourself, You could buy a pup elsewhere with no apparent issues, and if something cropped up the breeder might dump you in the dark and deny all responsibility]
I hope you will sleep on this... It does seem to me the breeder cares, which is a big plus point in this day & age of pups mass bred for the fun of it with no comeback. A rescue can be more of a gamble, which may not suit you right now.
Think most of all, as you are having a difficult time - be sure another dog is what is what you want, right now - regardless of where it comes from. If not, then waiting a few months for the Right dog is probably the right thing