It may depend on whether you want an integrated sink/vanity or a separate vanity that you drop the sink into, but I do have one suggestion. When we remodeled, we bought a bunch of fixtures (sinks, toilets, faucets, etc.) at the Fixture Gallery on Stone Way. They have a great selection of big-name fixtures. I believe it is open to the public, but they are probably more used to dealing with contractors, so if you have one, have them make an appointment for you and maybe go along.
It is good to have an appointment, because then a salesperson who knows the products will be able to walk around the showroom with you. This sounds obnoxious in principle, but is actually useful, since they'll ask the right questions about your situation and help you pick out something that will work in the space you have. They're not high-pressure salespeople at all.