"Theracurmin" is water-soluble circumin which is supposed to be more bioavailable. They apparently tested it on lab rats. No experience with it myself.
Agree with raydawg, but if you can't find fresh turmeric (markets near me never have it), getting ground turmeric spice is a better option than a pill. If you're getting it from a reputable company like Simply Organic or Frontier, you can ensure that it's the real thing as opposed to the capsules which are way overpriced and unregulated.