I have done it. I have found the perfect LBD.
(But I could only find a photo of the dress in NAVY! Crikey!)
I am wearing the black version of this Theory dress today and let me tell you, it is perfection. Comfortable, flattering, and could easily be taken from day to night. Personally, I'd toss off the beige Chanel flats and novelty kate spade necklace and trade it for my black Christian Louboutin Proratas and a delicate eternity necklace. Small changes, big difference.
Theory is one of the few brands that I will pay full retail for. At $160, this is a relatively well priced, high quality dress that you can wear again and again (and again and again).
P.S. I bought mine at Saks, and I'll keep searching for this dress online for you. The style number is B0124613.