I would totally take the deal, especially if you absolutely love it and feel amazing in it! Finding THE DRESS is such a process, and if you have found it, I would hold on to it... Also, as far as letting the bust out, If they are professionals, and they say that it can be done, why the heck not? And you'll most likely have quite a few fittings to make sure you get it just the way you want it. Go for it