thanks for the help!! Time to go bike shopping =)
Anyways I don't plan to buy a mongoose bike. I'm going to try to search for bikes made at a bike shop. Hopefully something from Trk, Raleigh, or Giant. I heard lots of good things about bike shops like: they know how to build it properly, they can repair it for you, they can adjust the bike, they can tune it up, etc.
Thanks again!