What is your price range? I'm going to assume the less expensive the better without compromising quality.
I think you can not go wrong with a black patent or metallic belt. They are versatile and will sharpen up an outfit.
I have this and I love it. It's not skinny, but it looks great over cardigans, dresses, and tunics (it's also on sale for a great value right now):
http://www1.bloomingdales.com/.....*-1*-1*Y*8
Here's a skinny belt in both black and metallic on sale at ATL right now:
http://www.anntaylorloft.com/c.....;cid=A0001
I also really like this ivory Michael Kors belt at bluefly right now. It has some visual interest, but it's still very versatile:
http://www.bluefly.com/pages/p.....nny%20belt
I also really like double wrap skinny belts that are pretty popular right now. I can't find a good example other than this expensive one. I like the rocker edge it has as well, but I don't know how that fits into your style:
http://shop.nordstrom.com/S/29.....0423bb4e79
I hope I helped! If you hate all of my examples (I won't be offended), go to http://www.shopstyle.com (a great fashion search engine) and type in "skinny belt" or whatever you are looking for and you can even narrow your search down by size, color, and price. Good luck and let us know what you choose!