Great Beginnings. We looked at Baby 2 Teen also, but GB's customer service was fantastic.
I know a lot of people have been pleased with Ikea too. I'd suggest getting the book Baby Bargains since it rates furniture and is a great resource on brands etc.
Great Beginnings in MD and Baby 2 Teen in VA both have great prices.
We got our crib from Buy Buy Baby... it was a gift from the in-laws. Of course, that was before we knew about GB and B2T. We probably would have gotten our crib at one of those places if we'd known, just because I think the prices are better.
Burlington Coat Factory has a lot of great furniture for discounted prices. We got a crib there on sale for an excellent price. I suggest going to the store first to look and then going home to check reviews before purchasing anything just to make sure you are getting decent quality.