You will have to test ride some bikes. Many of the models discussed in the other thread have been changed. I bought a 2013 Specialized Camber because it was amazing despite me ticking off at 333 when I bought it. Specialized changed the bike, now called a Stumpjumper ST, that I test rode on a local trail before buying my new bike. After losing more than 50 pounds, the new ST was a wallowing pig and not ridable at all. I did a ton of research before settling on my SC Hightower which is AMAZING and would be great for a heavier rider, but SC just changed the design in the last few weeks which has not been tested.
Go get on some bikes!