What is the best mb for under $500? I am going to be riding it to school a lot, also in the bluffs, going off compacted dirt jumps and landing on compact dirt. It is kinda bumpy too. I was at my LBS today checking out mountain bikes, and I saw the Diamondback Response Sport. Is that a good mb for what I will be applying it to? How does that compare to the Komodo 2.0? Thanks in advance.