Help me find a sexy but sophisticated dress for my birthday!

[MyChildDoesntNeedSleep]

I'm going out with the girls for my birthday. I'm planning on going to classy places(!)

Please help me find a dress. I'm thinking sexy but sophisticated. I'd love to find a long black dress with a plunging neckline, nipped in waist and maybe a sexy slit. I can see it in my head, but can't find anything like that in the shops. Looks like short is in at the moment.

I'm 5'9 1/2, size 8-10 (more a 10 at the moment), not much bust.

What do we think of this one? Ted Baker Body Con Dress

So I'm not limiting myself to long...any ideas guys?

Oh, I'm in my early thirties.

The dress was a hit! I wore the black one. I wore black suede heels, a glittery black clutch, and gold jewellery to go with the gold belt. I had compliments on how I looked all night. I woke up the next morning on such a high. Didn't think I'd feel like that the day after becoming yet another year older!

PS the dress seemed shorter on me than on the model in the link. I thought models were meant to be tall?!