I'm not going to focus on the finances - as, really, I don't think there's any use in commenting about that.
It is really hard to move on from the loss of a dog, particularly one that means so much to you. But I just don't see how after only two months, when one of those months you admit all you could do was cry, you can be ready and, ultimately, I don't think it would be fair on the puppy.
I breed, so I speak to a lot of people who have had dogs before and are looking for a puppy. I often speak to people who are fresh out of a loss and desperate for something to fill the void or give them 'focus.'
Very often, although they recognise that the new puppy won't replace their dog - and instead, as you say, it gives them something to 'focus on' - don't realise that they end up not bonding with the puppy very quickly as a result. It's not about being 'in-sync' with the puppy - it's about giving the puppy what it needs, and an owner grieving another dog is not that. I know lots of people will say that's nonsense, but from my experience it's true. Yes, it helps the humans with the 'moving on' (as it were) from the loss. But equally, if you're still mourning one dog, I think there is a question about how quickly you build that bond with a new puppy - and puppies deserve unconditional love and someone who is focussing on them because they're ready to love a new dog, not because they want a distraction from their grief.
My advice? Use the time you have without a dog wisely - research good breeders. I know you say you've got one, but are you hand on heart confident they are the best - because, personally, I don't think good breeders would sell to you currently. I don't mean that to be nasty, but it's so obvious from the way you've written your post that you're struggling that I don't believe it wouldn't have come across in any interaction with a breeder. Perhaps volunteer at a rescue, or spend time around other peoples dogs.
There was someone about six months ago who posted about her grief over losing her dog. Everyone said 'get a new dog.' She did. Within a month she was creating new posts several times a week about how much she disliked the puppy, how it wasn't anything like her old puppy, how it wouldn't cuddle her etc. The puppy deserved better, being frank.
Yes, there are posters who do it and are soo happy. And it's great to see that (There's a woman ATM who just lost her soul dog and got a new puppy - a Rottie - and she's so clearly happy, and it is lovely). But those people are so rare. They are the exception, not the rule.
Your grief, at least from what you've written, still feels far too raw for you to be ready - IMO. And I think you and, any puppy, would suffer as a result.
Your DH says no, so that's the end of it really. But I hope the above advice helps. And I am really sorry for your loss.