Are you looking to purchase a home at a foreclosure auction or just a REO home? Any agent should be able to assist you with a REO home. Besides a good Realtor I always advise to make sure you get a home inspection!
I agree with Anna's comments below. Most experienced agents have worked with foreclosures. In addition, foreclosures are no longer the deal they once were. I would look for the best home for you and let your experienced agent negotiate the best deal for you.