I went with a friend to go bike riding at our local park, Oleta park, and got my first taste of mountain biking. After going through the beginners, and a little of the intermediate course, I really want to get into it! I was especially amazed at not only the community, but how people easily rode over tree roots and sharp turns in the woods like nothing! I was stuck to the side, getting out of the way of the more experienced riders, breaking and afraid I was going to fall, and these people were riding right over it on the trails! So I went to 2 bike shops in my area and feel pretty good about getting a rockhopper. Theirs cost $587, but after doing more research online not sure about all the details but online it seems like they start around $500. Should I get one of those as my first bike, or what are other suggestions? I want to spend around $600 including seat and maintenance for my first ride. Any suggestions on the best bike to purchase?