I'm in about the same boat as you. I just bought a lovely suit from the Limited. It was a bit pricey for me ($170 for the jacket, and I can't remember how much I spent on pants), but it fits me really nicely. I have the same body issues as you (big boobs and little everywhere else), and the Limited works pretty well for me. I'd second AT Loft and J Crew for young looking but professional clothes. J Crew actually has the best fitting button down shirts I've found for my shape.
Express has crappy dress clothes, so I'd stay away. I also typically wouldn't wear anything from Talbot, but I'm pretty stylish.
