''This comparison is like apples and oranges, I realize,
but DH has made it clear that I can't have both. I would love to read the thoughts of the majority who will rule in favor of the Birkin, as much as the minority who will root for the underdog.
Looking forward to your comments![/QUOTE]''
The above highlighted statement really jumped out at me. So this is his reasoning why you can't keep a bag that would only fetch, from what you say, one eighth to one tenth of the cost of a Birkin ( according to the leather you choose)? If he is going to write you a blank cheque for a Birkin, then he obviously doesn't need you to sell your beloved bag to help pay for it, so in my opinion, his reasoning that you must get rid of it is unreasonable to me. You can obviously keep this bag without financial issues to get the Birkin, he knows you love the bag, so asking you to get rid of it makes no sense.
If it were me, I wouldn't go along with these tactics of his as although I don't know your husband and he could be a great guy, from what you say,
this idea is controlling in my opinion and unfair. I would save for the Birkin myself and keep the other bag is my best advice.