it all depends on what type of riding you do. diamondback bikes are sturdy and hard to break, redlines are really light and mongoose is a waste of time and energy and so are next bikes. my favorite bike manufacturer is verde bmx bikes.
i have a hoffman scarab with no gyro. it has a back brake, street tire, dirt tire in the front and a double wall chrome rim in the back. it is around 35 pounds and i would like to make it around 25 pounds.