First of all, congratulations on your 40th, and also on your new baby (I don't know how old he is -- I've obviously missed a bit! -- but last time I saw a pic of you, you were preggers!).
OK, the handbag. My disclaimer: I'm not a bag girl. When it comes to bags, I just don't get it. I'm clearly lacking the handbag gene. However, I'm reading all these gushing, swooning comments so I understand that, to people in the know, Miss Scarlet is a very nice bag. So here's my take:
1. You find the bag so visually appealing that you hugged the sale assistant in a moment of rapture.
2. You named the bag. La Belle Demimondaine makes a good point.
3. You are prepared to spend serious coin on an item that will mark a milestone, possibly a turning point, in your life.
I vote keep it. You clearly love it, and to my eye it looks the same as the other one you were coveting. Again, I'm not in the know when it comes to Chanel bags, but neither is 98% of the rest of the world, and if you love the bag and it's pretty and it suits your style, which it does, then go for it. I don't think you will regret it. And Angie (who certainly DOES know her bags) gave you a "killer", which is as good a blessing as you're going to get anywhere.
Plus, this way you could also get an expensive trench. It's a win-win!