Replying to Trail Bikes

Ok, so i just watched that video that someone posted of danny mac trail biking. a bunch of my friends do it and i just feel kinda left out cuz im the only one who mountain bikes. So i want NSers opinions on some good beginner trail bikes and what your thoughts are about trail biking. my friends are douch bags and just tell me to go on tartybike.com but thats no help in helping me find a beginner bike. so anyone know any good websites in the U.S. that sells trail bikes...?