I own a specialized. Works great. If you are not into the hardcore stuff, buy the hardtail. All the above suggestions are good ones. I do recommend disc brakes if you do alot of wet/mud riding, same with the clip"less" pedals. I'd consider buying a lower series bike, and upgrade to Avid mechanical disc brakes, and Crank Brothers Egg Beater pedals.
www.jensonusa.com has the best prices ive seen on bike components.