you buy very stronger and legendary frame, and i think if you want great brake you only need to buy try-all croco brown pads and made hard grind.
This frame may wark for you many years, and i think it's bad desire to change frame.
About rear wheel, this rim very light weight and so stronger, like echo, but more lighter then echo. and hub, it's try-all old-style hub, and i think you didn't has problem with this hub.
i think it's great bike for new rider, and all parts good, and i think you should change parts only when they broke.