Get ready to spend a few thousand if you want something that won't destroy itself in a day. You will need a full-suspension trail bike with a minimum of 140mm travel front and rear to do what you're looking to do. A bike like this isn't cheap and they generally start around $2,000. JensonUSA.com - Your Mountain & Road Bike online parts supplier
usually has some good closeouts. Mountain Bike Review
is a great source of information. You are about to get hooked on an expensive sport and it only gets worse
, luckily it is so much damn fun and an amazing workout.