Hello, I have just basically bought my first mountain bike "Airwalk, The Transfer 26" and was not impressed. The whole crankset is mangled and warped from the amount of stress I have put on it, but heres the thing, it was within the first 3 months. So I'm looking to replace, but I'm new to bike parts, and I don't know what kind of crankset I should get via specs. I am also looking for one cheap and reliable so it doesn't fold under pressure. Any suggestions would be great. Here is a picture of my bike.