Victoria's Secret has a really pretty satin shoe if you want to go with a pop of color:
Sorry, couldn't figure out how to post the actual shoes, but hopefully that link will work, if not do a search for 'satin shoe' and it will show up in the first picture, a pretty medium peridot.
Here is another from the same site, it's a blush, which I think looks gorgeous with black, and it has really interesting pretty cutouts that make it more sexy, I think.
Victoria's Secret - Peep-toe pump
Pull it together with a fantastic reasonably priced clutch (picked a color attempting to match, but this comes in what looks like 50 different colors, and there are other cute clutches and bags- so you can get exactly what works). And yes, it's odd to go to a bridal place for your clutch, but it works, and so why not? Just keep it our little secret.....shhhhh........
David's Bridal - Dyeable elongated clutch with crystals.
Then there's always the basic neutral heel, a platform nude colored leather/satin shoe that elongates your leg, a lot of celebrities are doing that, Jessica Simpson has a few nice styles in her collection and that's well within your budget, you've splurged on your dress and your accessories will gild the lily.
Keep us updated and let us know what direction you decided to go. We'll expect a picture! Good luck and happy hunting!